PDF User Manual

  1. Home
  2. Manuals
  3. Telco Systems Metrobility T3 2115-23-01 Installation & User Manual

Telco Systems Metrobility T3 2115-23-01 Installation & User Manual

Metrobility T3 2115-24-01\ Metrobility T3 2115-25-01\ Metrobility T3 2115-27-01\ Metrobility T3 2115-2X-01\ Metrobility T3 2115-2J-01\ Metrobility T3 2115-26-01\ Metrobility T3 2115-2Y-01\ Metrobility E3 2175-23-01\ Metrobility E3 2175-24-01\ Metrobility E3 2175-25-01\ Metrobility E3 2175-26-01\ Metrobility E3 2175-2J-01\ Metrobility E3 2175-27-01\ Metrobility E3 2175-2X-01\ Metrobility E3 2175-2Y-01

Made by: Telco Systems
Type: Installation & User Guide
Category: Media Converter
Pages: 24
Size: 0.63 MB

 

Download PDF User Manual



Full Text Searchable PDF User Manual



background image

Installation & User Guide

 

Models: 2115-23-01 / 2115-24-01 / 2115-25-01 / 2115-26-01 / 

 

 

2115-27-01 / 2115-2J-01 / 2115-2X-01 / 2115-2Y-01 / 

 

 

2175-23-01 / 2175-24-01 / 2175-25-01 / 2175-26-01 / 

 

 

2175-27-01 / 2175-2J-01 / 2175-2X-01 / 2175-2Y-01

Metrobility

®

T3/E3 “twister”

®

SM

PWR

T3-FX

T3-TX

®

“twister”   

2115

SM

E3-FX

E3-TX

®

“twister”   

2175

MM

PWR

T3-FX

T3-TX

®

“twister”   

2115

LBK

LK

LBK

LK

MM

E3-FX

E3-TX

®

“twister”   

2175

PWR

PWR

RX

TX

RX

TX

RX

TX

RX

TX

TX

RX

TX

RX

LBK

LK

LBK

LK

LBK

LK

LBK LK

LBK

LK

LBK LK

TX

RX

TX

RX

T3-BWDM

T3-TX

®

“twister”   

2115

PWR

LBK

LK

LBK LK

TX

RX

E3-BWDM

E3-TX

®

“twister”   

2175

PWR

LBK

LK

LBK LK

TX

RX

 


background image

This publication is protected by the copyright laws of the United States and other countries, with all rights re-

served. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed, or 

transmitted, in any form, or by any means manual, electric, electronic, electromagnetic, mechanical, chemical, 

optical or otherwise, without prior explicit written permission of Telco Systems, Inc.

© 2006 Telco Systems, Inc. 

       

All rights reserved.           

 

Printed in USA.

Metrobility

®

 T3/E3 Models

T3 Copper to T3 Fiber: 

        2115-23-01 ______T3 BNC to T3 multimode SC

        2115-24-01 ______T3 BNC to T3 singlemode SC

        2115-25-01 ______T3 BNC to T3 multimode ST

        2115-26-01 ______T3 BNC to T3 singlemode ST

        2115-27-01 ______T3 BNC to T3 singlemode SC (40km)

        2115-2J-01 ______T3 BNC to T3 singlemode SC (100km)

        2115-2X-01 ______T3 BNC to T3 singlemode SC 1550/1310nm bidirectional wavelength 

division multiplexed (BWDM)

        2115-2Y-01 ______T3 BNC to T3 singlemode SC 1310/1550nm BWDM

E3 Copper to E3 Fiber: 

        2175-23-01 ______E3 BNC to E3 multimode SC

        2175-24-01 ______E3 BNC to E3 singlemode SC

        2175-25-01 ______E3 BNC to E3 multimode ST

        2175-26-01 ______E3 BNC to E3 singlemode ST

        2175-27-01 ______E3 BNC to E3 singlemode SC (40km)

        2175-2J-01 ______E3 BNC to E3 singlemode SC (100km)

        2175-2X-01 ______E3 BNC to E3 singlemode SC 1550/1310nm BWDM

        2175-2Y-01 ______E3 BNC to E3 singlemode SC 1310/1550nm BWDM

 


background image

Table of Contents

Metrobility T3/E3 “twister” Installation & User Guide

Overview

  ..................................................................................................................... 4

Installation Guide 

  ..................................................................................................... 5

              STEP 1: Unpack the Media Converter and Accessories................................ 5

              STEP 2: Choose an Appropriate Location .................................................... 5

              STEP 3: Set the Switches  ............................................................................. 6

              STEP 4: Connect to the Network .................................................................. 7

              STEP 5: Apply Power.................................................................................... 8

User Guide

 ................................................................................................................ 11

              LED Indicators ............................................................................................ 11

              Theory of Operation .................................................................................... 12

              Link Loss Indications .................................................................................. 14

              Loopback Modes ......................................................................................... 16

              Topology Solutions...................................................................................... 18

              Technical Specifications .............................................................................. 19

              Acronyms and Abbreviations ...................................................................... 21

              Product Safety, EMC and Compliance Statements ..................................... 22

              Warranty and Servicing ............................................................................... 23

Metrobility, Metrobility Optical Systems, and “twister” are registered tradmarks and the Metrobility Optical 

Systems logo is a trademark of Telco Systems, a BATM company. All others are trademarks of their respective 

owners.

The information contained in this document is assumed to be correct and current. The manufacturer is not 

responsible for errors or omissions and reserves the right to change specifications at any time without notice.

 


background image

 Overview

Metrobility T3/E3       5

Overview

Thank you for choosing the Metrobility T3/E3 media converter.

The Metrobility T3/E3 media converter from Systems provides high-speed inte-

gration and conversion of T3 (44.736Mpbs) or E3 (34.368Mbps) coaxial telco com-

munication lines to fiber transport environments. The copper data stream is converted 

to optical signals for greater noise immunity and longer transmission. The T3/E3 

model supports remote fiber optic links up to 2km over multimode and up to 100km 

over singlemode cable. 

To optimize your T3/E3 network, this plug-and-play media converter operates 

seamlessly with low jitter. All signal activity is completely converted ensuring 

accurate communication within connected segments. The Metrobility T3 model 

features a user-selectable line build out, and all T3 and E3 models include 

independent copper and fiber loopback modes to isolate problems within a specific 

segment of the network.

The Metrobility T3/E3 media converter offers the following key features:

•  B3ZS (T3) or HDB3 (E3) line code support on the coaxial interface.

•  System and port LEDs on the front panel for easy visual diagnostics.

•  Independent copper and fiber loopback modes.

•  User-selectable line build out for short or long haul operation on the T3 

models.

•  Coaxial to multimode conversion up to 2km, coaxial to singlemode conver-

sion up to 100km, or coaxial to bidirectional wavelength division multi-

plexed (BWDM) conversion up to 20km.

•  Surge protection on the RX and TX ports of the coaxial interface.

•  Low jitter for maximum transmission quality.

•  Independent clocking on the RX and TX ports.

•  High MTBF.

 


background image

 Overview

Metrobility T3/E3       5

Installation Guide

1

2

Follow the simple steps outlined in this section to install and start using your 

Metrobility T3/E3 media converter.

 

Unpack the Media Converter and Accessories

Check that the following components have been included with your order:

   • Metrobility T3/E3 media converter

   • Power supply

   • Power supply cord

   • Four (4) rubber feet

Your order has been provided with the safest possible packaging, but ship-

ping damage does occasionally occur. Inspect your order carefully. If you 

discover any shipping damage, notify your carrier and follow their instruc-

tions for damage and claims. Save the original shipping carton if return or 

storage of the unit is necessary. 

 

Choose an Appropriate Location

The Metrobility T3/E3 media converter is intended for use in either office or 

industrial environments. The unit must be located within six (6) feet of the 

AC power source being used and placed as far away as possible from elec-

trical noise generating equipment such as copiers, electrostatic printers and 

other motorized equipment. If exposed twisted-pair wiring is used nearby, 

the wiring should be routed as far away as possible from power cords and 

data cables to minimize interference. 

The unit may be oriented in any manner which permits the user to make 

physical connection to the power supply and leaves a minimum of six (6) 

inches of space for proper ventilation.

TUV Compliance Note: For pluggable equipment, the socket outlet must be 

installed near the equipment and be easily accessible.

Bei Geräten mit Steckanschluß muß die Steckdose nahe dem Gerät ange-

bracht und leicht zugänglich sein. 

 


background image

 Installation Guide

Metrobility T3/E3       7

LBO Switch (functional only on T3 models)

Set the Line Build Out (LBO) switch down to support a long haul con-

nection if the length of your coaxial cable is between 255 and 1200 feet. 

Set LBO up to support a short haul connection if the length of your coaxial 

cable is less than 255 feet. The default setting is short haul.

CLP Switch

The Copper Loopback (CLP) switch enables/disables loopback on the cop-

per port. When copper loopback is enabled, the incoming data and clock 

are looped from the RX copper port to the TX copper port, thus returning 

the copper input back to the sending device. At the same time, the data is 

transmitted to the remote T3/E3 unit. However, data from the remote unit 

is ignored. Loopback is disabled by default. For more information, refer to 

Loopback Modes

 in the User Guide section of this manual.

FLP Switch

The Fiber Loopback (FLP) switch enables/disables loopback on the fiber 

optic port. When fiber loopback is enabled, the incoming data and clock are 

looped from the RX fiber port to the TX fiber port. The data is also trans-

mitted to the copper port, however, data from the copper port is ignored. 

Loopback is disabled by default. For more information, refer to 

Loopback 

Modes

 in the User Guide section of this manual.

3

 

Set the Switches

A set of DIP switches is located on the back of the unit. On the T3 models, 

functional switches are clearly labeled and allow you to select from several 

modes of operation. On the E3 models, only the switches labeled CLP and 

FLP are functional. Unmarked switches are inoperative. 

NOTE:

  The switch is ON when it is in the DOWN position. 

The switch is OFF when it is in the UP position.

��

��

 


background image

 Installation Guide

Metrobility T3/E3       7

 

Connect to the Network

The Metrobility T3/E3 model offers the ease of plug-and-play installation. 

Once power is applied to the unit, correct connectivity can be verified via 

the link (LK) LED.

To connect to the network, insert the cables into the appropriate connectors 

as illustrated below. 

When making network connections, make sure that the receive (RX) port 

on the unit connects to the transmit (TX) port of the connected device, and 

make sure that the receive port of the connected device connects to the 

transmit port of the Metrobility model.

4

SM

E3-FX

E3-TX

T3-FX

T3-TX

LK

LK

PWR

LBK

“twister”

®

 2175

“twister”

®

 2115

RX

TX

LBK

SM

RX

LK

PWR

LBK

MAN

LK

LK

TX

RX

TX

RX

 


background image

 Installation Guide

Metrobility T3/E3       9

Coaxial Interface

The coaxial interface provides two BNC connectors. The receive port is 

labeled RX and the transmit port is labeled TX. Each connector supports a 

maximum segment length of 1200 feet. Use only RG-59 cables. 

Fiber Optic Interface

2115-23-01, 2115-25-01, 2175-23-01 and 2175-25-01: The fiber optic 

multimode (MM) interface supports a maximum segment length of 2km for 

remote links.

2115-24-01, 2115-26-01, 2175-24-01 and 2175-26-01: The singlemode 

(SM) connector supports a maximum segment length of 15km. 

2115-27-01 and 2175-27-01: The singlemode long haul interface supports a 

maximum segment of 40km. 

2115-2J-01 and 2175-2J-01: The singlemode extended long haul interface 

supports a maximum segment length of 100km.

BWDM Interface

The 2115-2X-01, 2115-2Y-01, 2175-2X-01 and 2175-2Y-01 provide one 

bidirectional wavelength division multiplexed (BWDM) SC connector 

which supports a maximum segment length of up to 20km for remote links. 

BWDM units must always be used in complementary pairs. That is, a-2X 

model must be connected to a -2Y. The -2X unit is designed to transmit data 

at a wavelength of 1550nm and receive at 1310nm. Correspondingly, the 

-2Y unit transmits data at 1310nm and receives at 1550nm.

Metrobility

-2X Model

Metrobility

-2Y Model

up to 20km

 


background image

 Installation Guide

Metrobility T3/E3       9

5

 

Apply Power

Power is provided through the desktop power supply module. This power 

module is equipped with an S760 hollow-type plug for insertion into the DC 

jack located on the back of the unit and a standard IEC 320-type AC power 

receptacle.

When making power connections, it is recommended that the DC power 

cord be connected to the DC input jack located on the back of the media 

converter 

before

 making the AC connection to the outlet. 

PWR

DC INPUT/5VDC

ON

OFF

LBOCLPFLP

Upon receiving power, the media converter goes into normal operation 

mode and automatically provides the appropriate signal translation between 

the connected network segments.

Verify correct segment connectivity via the LK LEDs on the front panel. 

If an additional extension cord is used to connect the power module to the 

power source, the following guidelines must be followed.

While one end of the AC power cord can be fitted with whatever plug 

is standard for the country of operation, the end that connects to the 

power supply module must have a female plug that fits this type of AC 

receptacle.

 

 


background image

10 

 Installation Guide

Metrobility T3/E3       11

•  AC 115V (North American): use a UL-listed and CSA-certified cord 

set consisting of a minimum 18 AWG, type SVT or SJT three-con-

ductor cord, a maximum of 15 feet in length and a parallel blade, 

grounding-type attachment plug rated 15A, 125V.

•  AC 230V (USA): use a UL-listed cord set consisting of a minimum 

No. 18 AWG, type SVT three-conductor cord, a maximum of 15 feet 

in length and a Tandem blade grounding-type attachment plug rated 

15A, 250V.

•  240V (outside USA): use a cord set consisting of a minimum No. 18 

AWG cord and grounding-type attachment plug rated 15A, 250V. 

The cord set should have the appropriate safety approvals for the 

country in which the unit is being installed and marked HAR.

 


background image

10 

 Installation Guide

Metrobility T3/E3       11

User Guide

This section contains more detailed information regarding the operating features 

of the Metrobility T3/E3 media converter.

LED Indicators

The Metrobility T3/E3 media converter provides several LEDs on the front panel for 

the visible verification of unit status and proper functionality. These LEDs can aid in 

troubleshooting and overall network diagnosis and management. 

D

E

L

m

e

t

s

y

S

D

E

L

l

e

b

a

L

/r

o

l

o

C

s

u

t

a

t

S

n

o

it

a

c

i

d

n

I

R

W

P

n

e

e

r

G

.r

e

w

o

p

g

n

i

v

i

e

c

e

r

s

i

ti

n

U

F

F

O

.

d

e

li

a

f

s

a

h

r

o

r

e

w

o

p

g

n

i

v

i

e

c

e

r

t

o

n

s

i

ti

n

U

s

D

E

L

t

r

o

P

r

e

p

p

o

C

D

E

L

l

e

b

a

L

/r

o

l

o

C

s

u

t

a

t

S

n

o

it

a

c

i

d

n

I

K

L

n

e

e

r

G

.t

r

o

p

e

v

i

e

c

e

r

r

e

p

p

o

c

e

h

t

n

o

t

n

e

s

e

r

p

s

i

l

a

n

g

i

s

A

F

F

O

.t

r

o

p

e

h

t

t

a

d

e

t

c

e

t

e

d

s

i

l

a

n

g

i

s

o

N

K

B

L

w

o

ll

e

Y

e

h

t

n

o

s

e

m

a

rf

g

n

i

m

o

c

n

I

.

e

d

o

m

k

c

a

b

p

o

o

l

n

i

s

i

tr

o

p

r

e

p

p

o

C

s

i

a

t

a

D

.

e

n

il

ti

m

s

n

a

rt

l

a

i

x

a

o

c

e

h

t

n

o

k

c

a

b

t

n

e

s

e

r

a

tr

o

p

r

e

p

p

o

c

.

e

n

il

ti

m

s

n

a

rt

c

it

p

o

r

e

b

if

e

h

t

h

g

u

o

r

h

t

t

n

e

s

o

s

l

a

F

F

O

.

n

o

it

a

r

e

p

o

l

a

m

r

o

n

;t

r

o

p

r

e

p

p

o

c

e

h

t

n

o

d

e

l

b

a

s

i

d

s

i

k

c

a

b

p

o

o

L

s

D

E

L

t

r

o

P

c

it

p

O

r

e

b

i

F

D

E

L

l

e

b

a

L

/r

o

l

o

C

s

u

t

a

t

S

n

o

it

a

c

i

d

n

I

K

L

n

e

e

r

G

.t

r

o

p

e

v

i

e

c

e

r

c

it

p

o

r

e

b

if

e

h

t

n

o

t

n

e

s

e

r

p

s

i

l

a

n

g

i

s

l

a

c

it

p

o

n

A

F

F

O

.t

r

o

p

r

e

b

if

e

h

t

t

a

d

e

t

c

e

t

e

d

s

i

l

a

n

g

i

s

o

N

K

B

L

w

o

ll

e

Y

e

r

a

k

c

o

l

c

d

n

a

a

t

a

d

g

n

i

m

o

c

n

I

.

e

d

o

m

k

c

a

b

p

o

o

l

n

i

s

i

tr

o

p

r

e

b

i

F

t

u

o

d

e

tt

i

m

s

n

a

rt

o

s

l

a

s

i

a

t

a

D

.

e

n

il

r

e

b

if

ti

m

s

n

a

rt

e

h

t

n

o

k

c

a

b

t

n

e

s

.

e

n

il

ti

m

s

n

a

rt

l

a

i

x

a

o

c

e

h

t

F

F

O

.

n

o

it

a

r

e

p

o

l

a

m

r

o

n

;t

r

o

p

r

e

b

if

e

h

t

n

o

d

e

l

b

a

s

i

d

s

i

k

c

a

b

p

o

o

L

 


background image

12 

 Installation Guide

Metrobility T3/E3       13

Theory of Operation

Functional Block Diagram

Line 

Transformers

Line

Interface

Unit

FPGA

VCXO

Fiber 

Optic 

Circuit

RX

Coaxial

TX

TX

Fiber

RX

Coaxial to Fiber Data Path

The receive (RX) port on the coaxial interface accepts an electrical signal. This 

signal is coupled to the line interface unit (LIU) through a line transformer. The LIU 

performs clock and data recovery and converts the signal into non-return to zero 

(NRZ) data and clock. The NRZ data and clock then pass through the field-program-

mable gate array (FPGA), which encodes the data for fiber optic transmission. The 

encoding ensures adequate transition density for reliable clock recovery at the remote 

T3/E3 fiber optic interface.

Fiber to Coaxial Data Path

The RX port on the fiber interface accepts an optical signal from the remote T3/E3 

unit and converts it back to an electrical signal. The optical signal first enters the 

voltage-controlled crystal oscillator (VCXO), which extracts the line rate clock and 

data. The recovered clock and data are then sent to the FPGA for decoding. The de-

coded data stream goes to the LIU for encoding into T3 or E3 signals. The transmit-

ted signal is coupled to the BNC coaxial connector through a line transformer.

On both the RX and TX ports of the coaxial interface, surge protection is provided.

Timing Paths

The transmit (TX) and receive (RX) paths are clocked independently and during nor-

mal operation, the Metrobility T3/E3 units are never timing masters of the network 

system. In the coaxial to fiber path, timing is recovered by the unitʼs LIU and trans-

mitted over the fiber line to the remote T3/E3 unit. In the fiber to coaxial path, timing 

is derived from the incoming optical signal and sent over the coaxial TX line.

 


background image

12 

 Installation Guide

Metrobility T3/E3       13

Local

T3/E3

Unit

Remote

T3/E3

Unit

Coaxial

Coaxial

Fiber

A

F

C

B

E

D

The following table describes how timing is affected if a failure occurs at various 

points in the network.

e

r

u

li

a

F

e

n

i

L

t

n

i

o

P

tl

u

s

e

R

A

O

X

C

V

s'

r

e

v

i

e

c

e

r

r

e

b

if

e

h

T

.l

a

n

g

i

s

f

o

s

s

o

l

s

t

c

e

t

e

d

ti

n

u

3

E

/

3

T

l

a

c

o

l

e

h

T

.

B

k

n

il

r

e

b

if

r

e

v

o

n

o

i

s

s

i

m

s

n

a

rt

r

o

f

e

c

r

u

o

s

g

n

i

m

it

e

h

t

s

e

m

o

c

e

b

B

e

h

T

.t

u

p

n

i

k

c

o

l

c

e

c

n

e

r

e

f

e

r

s

ti

o

t

s

tr

e

v

e

r

O

X

C

V

s'

ti

n

u

3

E

/

3

T

e

t

o

m

e

r

e

h

T

.r

e

t

s

a

m

g

n

i

m

it

m

e

t

s

y

s

e

h

t

s

e

m

o

c

e

b

ti

n

u

3

E

/

3

T

e

t

o

m

e

r

C

,

g

n

i

m

it

d

e

p

o

o

l

s

tr

o

p

p

u

s

ti

n

u

3

E

/

3

T

e

t

o

m

e

r

e

h

t

o

t

d

e

t

c

e

n

n

o

c

t

n

e

m

p

i

u

q

e

e

h

t

fI

.l

a

n

g

i

s

f

o

s

s

o

l

s

t

c

e

t

e

d

ti

n

e

h

w

k

c

o

l

c

l

a

n

r

e

t

n

i

s

ti

o

t

tr

e

v

e

r

d

l

u

o

h

s

t

n

e

m

p

i

u

q

e

e

h

t

d

n

a

,

k

c

o

l

c

r

o

l

a

n

g

i

s

d

il

a

v

a

e

d

i

v

o

r

p

o

t

li

a

f

d

l

u

o

c

t

n

e

m

p

i

u

q

e

e

h

t

,

y

l

e

v

it

a

n

r

e

tl

A

.

D

t

n

i

o

p

t

a

d

e

rr

u

c

c

o

e

r

u

li

a

f

e

h

t

fi

s

a

e

v

a

h

e

b

lli

w

m

e

t

s

y

s

e

h

t

D

O

X

C

V

s'

r

e

v

i

e

c

e

r

r

e

b

if

e

h

T

.l

a

n

g

i

s

f

o

s

s

o

l

s

t

c

e

t

e

d

U

I

L

s'

ti

n

u

3

E

/

3

T

e

t

o

m

e

r

e

h

T

.

E

k

n

il

r

e

b

if

r

e

v

o

n

o

i

s

s

i

m

s

n

a

rt

r

o

f

e

c

r

u

o

s

g

n

i

m

it

e

h

t

s

e

m

o

c

e

b

E

l

a

c

o

l

e

h

T

.t

u

p

n

i

k

c

o

l

c

e

c

n

e

r

e

f

e

r

s

ti

o

t

s

tr

e

v

e

r

O

X

C

V

s'

ti

n

u

3

E

/

3

T

l

a

c

o

l

e

h

T

.r

e

t

s

a

m

g

n

i

m

it

m

e

t

s

y

s

e

h

t

s

e

m

o

c

e

b

ti

n

u

3

E

/

3

T

F

3

E

/

3

T

l

a

c

o

l

e

h

t

o

t

d

e

t

c

e

n

n

o

c

e

c

i

v

e

d

e

h

T

.

s

r

u

c

c

o

n

o

it

p

u

r

s

i

d

g

n

i

m

it

m

e

t

s

y

s

o

N

.l

a

n

g

i

s

f

o

s

s

o

l

s

t

c

e

t

e

d

ti

n

u

Data Transparency

The Metrobility T3/E3 media converter offers full data transparency. Any codes or 

commands contained within the data stream are passed through to the remote device. 

The only commands executed by the Metrobility converter are those set through the 

 


background image

14 

 User Guide

Metrobility T3/E3      15

Link Loss Indications

The following examples show the status of the LK LED under various link condi-

tions and describe when unframed all ones are generated. (Loopback is disabled in 

these examples.)

Note:

 An all-ones pattern indicates an alarm indication signal (AIS) for the E3 units 

only. For T3 models, the all-ones pattern is simply transmitted to the remote device; 

it does NOT indicate AIS.

Normal

The diagram below shows a typical configuration with good link status. 

Remote

Device

Local

Device

Local T3/E3

Unit

Remote T3/E3

Unit

green LED

unlit LED

Coax

Coax

Fiber

LK

LK

LK

LK

Input Coaxial Link Loss

Loss of the copper input disables the BNC portʼs LK LED. It also forces the T3/E3 

unit to generate unframed all ones (AIS for E3 only), which are transmitted out its fi-

ber port. For example, if the local unitʼs inbound coaxial cable breaks, it will transmit 

all ones to the remote T3/E3 unit via the fiber cable. The remote unit then carries the 

pattern forward via its coaxial cable to the remote device. 

Input Fiber Link Loss

Loss of the fiber input is indicated by the fiber portʼs unlit LK LED. When the fiber 

input is lost, an unframed all-ones pattern is transmitted from the coaxial port, as 

shown in the following illustration. 

Remote

Device

Local

Device

Local T3/E3

Unit

Remote T3/E3

Unit

green LED

unlit LED

Coax

Coax

Fiber

LK

LK

LK

LK

All Ones

All Ones

All Ones carried forward

 


background image

14 

 User Guide

Metrobility T3/E3      15

Remote Coaxial Link Loss

Loss of link to the remote device produces a red alarm condition at the remote site 

and should force the device to revert to its internal clock. If the remote device is 

configured to send back a yellow alarm under this condition, the two T3/E3 units will 

carry the alarm forward to the local device, as shown below. 

Remote

Device

Local

Device

Local T3/E3

Unit

Remote T3/E3

Unit

green LED

unlit LED

Coax

Coax

Fiber

LK

LK

LK

LK

All Ones

Remote

Device

Local

Device

Local T3/E3

Unit

Remote T3/E3

Unit

green LED

unlit LED

Coax

Coax

Fiber

LK

LK

LK

LK

AIS

AIS

AIS carried forward

AIS

 


background image

16 

 User Guide

Metrobility T3/E3      17

Loopback Modes 

The Metrobility T3/E3 media converter features two loopback modes to help verify 

correct installation and to diagnose system problems. 

Normal

During normal operation, without loopback, data from a local device (CSU, PBX, 

etc.) enters the local T3/E3 unitʼs coaxial receiver, passes through the fiber line be-

tween the two converters, then exits the remote unitʼs coaxial transmitter to enter the 

remote equipment, and vice versa.

Loopback

Loopback helps to isolate and identify traffic problems within a specific segment. 

During loopback, the yellow LBK LED is lit. Loopback is enabled/disabled by set-

ting DIP switch 2 or 3. Once loopback is enabled, the unit will remain in this mode 

until the DIP switch is turned off. 

Copper and fiber loopback cannot be enabled at the same time. If both DIP switches 

are enabled, only the first one set will be in effect until it is disabled.

Copper Loopback

During copper loopback, timing and data received on the coaxial line are looped 

back to the sending device. The loop occurs in the FPGA. The data is also 

transmitted to the remote T3/E3 converter, but the data from the remote unit is 

ignored by the converter in loopback mode. 

In the example shown below, the local T3/E3 unit has copper loopback enabled. 

Data received at the BNC port is simultaneously returned to the local device and 

sent to the remote T3/E3 unit and on to the remote device. Data from the remote 

device is transmitted by the remote unit, however, it is ignored by the local unit 

at its fiber optic interface.

Local T3/E3

Unit

Remote T3/E3

Unit

Coax

Coax

Fiber

Local

Device

Remote

Device

Local T3/E3 Unit

with Copper Loopback

Remote T3/E3

Unit

Coax

Coax

Fiber

Local

Device

Remote

Device

X

 


background image

16 

 User Guide

Metrobility T3/E3      17

Fiber Loopback

In this mode, the incoming data and clock on the fiber line are looped back. The 

loop occurs in the FPGA. The data is still sent out the coaxial transmitter. How-

ever, the data received at the BNC interface is ignored. 

In the example below, the remote T3/E3 unit has fiber loopback enabled. Data 

received at the fiber optic input is simultaneously returned to the local device 

and sent to the remote device. However, data from the remote device is ignored 

by the remote T3/E3 unit at its coaxial interface.

Local T3/E3

Unit

Remote T3/E3 Unit

with Fiber Loopback

Coax

Coax

Fiber

Local

Device

Remote

Device

X

 


background image

18 

 User Guide

Metrobility T3/E3      19

Topology Solutions

The Metrobility T3/E3 model is a point-to-point media converter designed to extend 

the reach of copper T3/E3 links and to provide protection from power surges and 

electromagnetic interference. Each model supports a single remote T3/E3 unit.

fiber T3/E3

copper T3/E3

up to 100km

singlemode

Private Branch Exchange (PBX)

PBX

Metrobility T3/E3 Model

Metrobility T3/E3 Model

up to 100km

singlemode

Data Service Unit (DSU)

Channel Service Unit (CSU)

Metrobility T3/E3 Model

Metrobility T3/E3 Model

Metrobility R5000 Chassis 
with T3/E3 Modules

up to 2km

multimode

PBX

CSU

Metrobility T3/E3 Model

 


background image

18 

 User Guide

Metrobility T3/E3      19

Technical Specifications

Network Connections

Coaxial Interface

Connector ______________________________________________ BNC receptacle

Impedance____________________________________________________ 75 ohms

Signal Structure  ________________________________ ANSI T1.404, T1404a (T3)

                            _________________________________________ ITU G.703 (E3)

Supported Link Length _______________________________________up to 1200 ft

Cable Type _________________________________________ RG-59 coaxial cable

Multimode Fiber Optic Interface

Connector ___________________________________________________ ST or SC

Wavelength ___________________________________________________ 1310 nm

RX Input Sensitivity _______________________________ -31 dBm peak minimum

Output Power   __________________________ -20 dBm to -14 dBm (62.5/125 µm)

Supported Link Length ________________________________up to 2km full duplex

Cable Type _____________________________________ 50/125, 62.5/125 µm F/O

Singlemode Fiber Optic Interface

Connector ___________________________________________________ ST or SC

Wavelength ___________________________________________________ 1310 nm

RX Input Sensitivity _______________________________ -31 dBm peak minimum

Output Power _______________________________-15 dBm to -8 dBm (9/125 µm)

Supported Link Length _______________________________up to 15km full duplex

Cable Type __________________________ 8.3/125, 8.7/125, 9/125, 10/125 µm F/O

Singlemode Fiber Optic Interface — long haul distance support

Connector ________________________________________________________ SC

Wavelength ___________________________________________________ 1310 nm

RX Input Sensitivity ____________________________________-35 dBm minimum

Output Power ________________________________ -5 dBm to 0 dBm (9/125 µm)

Supported Link Length _______________________________up to 40km full duplex

Cable Type __________________________ 8.3/125, 8.7/125, 9/125, 10/125 µm F/O

 


background image

20 

 User Guide

Metrobility T3/E3      21

Singlemode Fiber Optic Interface — extended long haul distance support

Connector ________________________________________________________ SC

Wavelength ___________________________________________________ 1550 nm

RX Input Sensitivity ____________________________________-37 dBm minimum

Output Power _______________________________ -3.0 dBm to 0 dBm (9/125 µm)

Supported Link Length ______________________________up to 100km full duplex

Cable Type __________________________ 8.3/125, 8.7/125, 9/125, 10/125 µm F/O

Singlemode BWDM Fiber Optic Interface

Connector ________________________________________________________ SC

Supported Link Length _______________________________up to 20km full duplex

Cable Type _______________________________________________9/125 µm F/O

(2115-2X-01, 2175-2X-01)

   TX Wavelength ______________________________________________ 1550nm

    RX Wavelength ______________________________________________ 1310nm

    RX Input Sensitivity __________________________________-32 dBm minimum

    Output Power______________________________-8 dBm to -15 dBm (9/125 µm)

(2115-2Y-01, 2175-2Y-01)

   TX Wavelength ______________________________________________ 1310nm

    RX Wavelength ______________________________________________ 1550nm

    RX Input Sensitivity __________________________________-32 dBm minimum

    Output Power______________________________-8 dBm to -15 dBm (9/125 µm)

Data Rate

Data Rate ______________________________44.736Mbps (T3); 34.368Mbps (E3)

Power

Input ______________________________________+5.0VDC @ 0.4A, 2W average

Environmental

Operating Temperature ________________________________________ 0° to 55° C

Storage Temperature ________________________________________ -30° to 70° C

Relative Humidity_______________________________5% to 95% non-condensing

Physical Case _____________________________ Fully enclosed metal construction

Dimensions _____________________________________4.38"L x 3.26"W x 1.71"H

                  ______________________________________12.3 cm x 8.3 cm x 4.3 cm

Weight (including power supply) _______________________________ 3 lb, 1.36 kg 

 


background image

20 

 User Guide

Metrobility T3/E3      21

Acronyms and Abbreviations

This list defines the acronyms and abbreviations used in this guide.

         

AIS

   Alarm Indication Signal 

      

ANSI

   American National Standards Institute 

      

AWG

   American Wire Gauge 

       B3ZS

   Bipolar Three Zeroes Substitution T3 line coding  

       

BNC

   Bayonet-Neill-Concelman connector

  

BWDM

   Bidirectional Wavelength Division Multiplexed 

        

CLP

   Copper Loopback 

        

CSA

   Canadian Standards Association 

        

CSU

   Channel Service Unit 

        

DSU

   Data Service Unit 

           E3

   34.368 Mbps communications standard

         F/O

   Fiber Optic

        

FLP

   Fiber Loopback

     

FPGA

   Field-Programmable Gate Array 

     

HDB3

   High Density Bipolar Three Zeroes Substitution E3 line coding

         

IEC

   International Electrotechnical Commission

         

ITU

   International Telecommunications Union 

 

       

LBK

   Loopback 

        LBO   

Line Build Out

         

LIU

   Line Interface Unit

          

LK

   Link 

      Mbps

   Megabits per second

         MM

   Multimode

     MTBF

   Mean Time Between Failures

       

NRZ

   Non-Return to Zero line coding

        

PBX

   Private Branch Exchange 

      

PWR

   Power 

          RX   

Receive

          SM

   Singlemode 

           

T3

   44.736 Mbps communications standard

          

TX

   Transmit

          

UL

   Underwriters Laboratories

    

VCXO

   Voltage-controlled crystal oscillator

 


background image

22 

 User Guide

Metrobility T3/E3      23

Product Safety, EMC and Compliance Statements

This equipment complies with the following requirements:

           •  UL                                                        •  ITU-G.703

           •  CSA                                                      •  G.704

           •  EN60950 (safety)                                 •  G.706

           •  FCC Part 15, Class A                           •  ANSI T1.403-1999

           •  EN55022 Class A (emissions)              •  ANSI T1.408

           •  EN55024: 1998 (immunity)                 •  Class 1 Laser Product

           •  IEC 825-1 Classification                      •  ICES-003 Class A (emissions)

           •  CB

This product shall be handled, stored and disposed of in accordance with all gov-

erning and applicable safety and environmental regulatory agency requirements. 

The following 

FCC 

and 

Industry Canada

 compliance information is applicable to 

North American customers only.

USA FCC Radio Frequency Interference Statement

This equipment has been tested and found to comply with the limits for a Class A 

digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to 

provide reasonable protection against harmful interference when the equipment 

is operated in a commercial environment. This equipment generates, uses and can 

radiate radio frequency energy, and if not installed and used in accordance with the 

instruction manual, may cause harmful interference to radio communications. Opera-

tion of this equipment in a residential area is likely to cause harmful interference in 

which case the user will be required to correct the interference at his own expense.

Caution:

 Changes or modifications to this equipment not expressly approved by 

the party responsible for compliance could void the userʼs authority to operate the 

equipment.

Canadian Radio Frequency Interference Statement

This Class A digital apparatus meets all requirements of the Canadian Interference-

Causing Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur 

le matériel brouilleur du Canada.

 


background image

22 

 User Guide

Metrobility T3/E3      23

Warranty and Servicing

Telco Systems’ Product Warranty

TELCO MAKES NO WARRANTIES EXCEPT AS HEREIN SET FORTH: Telco warrants that the equipment and ac-
cessories manufactured by Telco, when used in the application and manner for which they are intended, will be free from 
defects caused by faulty material or poor workmanship from the date of shipment. This warranty is subject to change at 
any time. The warranty that applies is that which is in effect at the time the equipment ships. Warranty period is specific 
to particular product offerings. These periods are as follows:
                     Metrobility Products- 1 year

IP and EdgeGate Products – 1 year

Telco’s liability under this warranty is limited to, the obligation, at Telco’s sole option, to repair or, to replace at Telco’s 
plant at Massachusetts, any part found to be defective under normal use and service within the warranty period specified 
herein, provided:

a) Telco is promptly notified in writing upon discovery of such defects;
b) The defective parts are returned to Telco, transportation charges prepaid in accordance with Telco’s 
instructions;
c) Telco’s examination shall disclose to its satisfaction that such defects have not been caused by misuse, 
abuse, neglect, accident, or adjustments other than those specified in the Telco Operating and Maintenance 
Manual. Telco shall have no responsibility under this warranty for defects, which have been caused by 
misuse, abuse, improper application, repair, alteration, accident or negligence in use, storage, transportation 
or handling. Further, the original identification markings must not have been removed, defaced or altered.
d) Equipment has been installed and operated, and maintained, in complete accordance with the Telco Oper-
ating and Maintenance Manual, and good engineering practice.

Though component parts of Telco-manufactured goods are covered by the above warranty, TELCO MAKES NO WAR-
RANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE NOR ANY OTHER WARRANTY, 
EXPRESS OR IMPLIED, FOR ANY EQUIPMENT OR MERCHANDISE NOT MANUFACTURED BY TELCO (FOR 
EXAMPLE BUT WITHOUT LIMITATION, ACCESSORIES AND AUXILIARY ITEMS). 

However, Telco will cooperate reasonably with Purchaser in attempting to secure, where possible, the benefit of any 
warranties which the manufacturer of such non-Telco items may provide. All ordered replacement parts or parts replaced 
during the warranty period assume the unexpired portion of the original parts warranty or ninety (90) days from date of 
shipment, whichever is longer.

Replacement, Repair or Refund Procedure for Hardware: 

Telco’s sole obligation under this express warranty shall 

be, at Telco’s option and expense, to repair the defective product or part or deliver to Customer an equivalent product or 
part to replace the defective item. All products that are replaced will become the property of Telco Systems. Replacement 
products or parts may be new or reconditioned. Telco warrants any replaced or repaired product or part for ninety (90) 
days from shipment, or the remainder of the initial warranty period, whichever is longer. Telco reserves the right to refund 
the purchase price paid for the defective product as its exclusive warranty remedy.

To Receive a Return Materials Authorization (RMA) Number: 

Please contact the party from whom you purchased the 

product. If you purchased the product directly from Telco Systems, contact the Telco Systems Customer Care Group.

Software: 

Telco warrants to Customer that each software program licensed from it will, if operated as directed in the 

user documentation, substantially achieve the functionality described in the user documentation for a period of ninety 
(90) days from the date of purchase from Telco or its authorized reseller. No updates or upgrades are provided under 
this warranty. Telco’s sole obligation under this express warranty shall be, at Telco’s option and expense, to refund the 
purchase price for the software product or replace the software product with software which meets the requirements of 
this warranty as described above. Customer assumes responsibility for the selection of the appropriate programs and as-
sociated reference materials. Telco expressly disclaims any warranty or representation that its software products will meet 
Customer’s requirements or work in combination with any hardware or software products provided by third parties, that 
the operation of the software products will be uninterrupted or error free, or that all defects in the software products will 
be corrected.

The foregoing warranties are in lieu of any and all other warranties, expressed or implied, including, but not limited to, 
warranties of merchantability, fitness for a particular purpose or against infringement of any rights of third parties. Telco’s 
liability on any claim for money damages (including, without limitation negligence for any loss or damage arising out of, 
connected with, or resulting from the sale of products hereunder, or from the performance or breach thereof, or from the 
design, manufacture, sale, delivery, resale, installation, inspection, repair, operation or use of any merchandise manufac-
tured by Telco) shall in no case exceed the price allocable to the merchandise or part thereof which gave rise to the claim. 
Purchaser will hold Telco harmless with respect to any claims or actions by third parties. In particular, Telco expressly 
disclaims and shall in no event be liable for any indirect, special, incidental or consequential damages.

 


background image

5660-000042 E

12/06

US Headquarters

2 Hampshire Street Suite 3A

Foxboro MA USA 02035

tel: 1.781.551.0300 • fax: 1.781.255.2344

www.telco.com 

Int'l Headquarters 

Germany 

Asia Pacific 

France

tel: +972.9.866.2525 

tel: +49 (0) 5331.8824.0  tel: (65) 6722.529901

 

tel: +33 (0) 1,567.12.773