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3onedata 7304 User Manual

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Category: Modem
Pages: 11
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MODEL7

MODEL7

MODEL7

MODEL7304

304

304

304

V.35

V.35

V.35

V.35 Optic

Optic

Optic

Optic Fiber

Fiber

Fiber

Fiber Modem

Modem

Modem

Modem

User

User

User

User Manual

Manual

Manual

Manual

Shenzhen

Shenzhen

Shenzhen

Shenzhen 3onedata

3onedata

3onedata

3onedata Technology

Technology

Technology

Technology Co.,Ltd

Co.,Ltd

Co.,Ltd

Co.,Ltd

Tel: +86-755-26702688

Fax: +86-755-26703485

www.3onedata.com

 


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MODEL7304 User Manual

Page 2 of 11

Contents

Contents

Contents

Contents

1.

1.

1.

1. Introduction

Introduction

Introduction

Introduction

..........................................................................................................................................3

2.

2.

2.

2. Product

Product

Product

Product Features

Features

Features

Features

...............................................................................................................................3

3.

3.

3.

3. Specifications

Specifications

Specifications

Specifications

..................................................................................................................................... 3

4.

4.

4.

4. Description

Description

Description

Description on

on

on

on Installation

Installation

Installation

Installation and

and

and

and Panels

Panels

Panels

Panels

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

4.1

4.1

4.1

4.1 Unpacking:

Unpacking:

Unpacking:

Unpacking:

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

4.2

4.2

4.2

4.2 Front/Rear

Front/Rear

Front/Rear

Front/Rear panels

panels

panels

panels of

of

of

of the

the

the

the stand

stand

stand

stand alone

alone

alone

alone device:

device:

device:

device:

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

4.3

4.3

4.3

4.3 Front/Rear

Front/Rear

Front/Rear

Front/Rear panels

panels

panels

panels of

of

of

of Rack-mountable

Rack-mountable

Rack-mountable

Rack-mountable casing:

casing:

casing:

casing:

.....................................................................6

5.

5.

5.

5. MODEL7304

MODEL7304

MODEL7304

MODEL7304 Application

Application

Application

Application

................................................................................................................7

5.1

5.1

5.1

5.1 Definition

Definition

Definition

Definition of

of

of

of signal

signal

signal

signal lines

lines

lines

lines at

at

at

at V.35

V.35

V.35

V.35 interface

interface

interface

interface

............................................................................. 7

5.1.1

5.1.1

5.1.1

5.1.1 Distribution

Distribution

Distribution

Distribution diagram

diagram

diagram

diagram of

of

of

of guiding

guiding

guiding

guiding feet

feet

feet

feet on

on

on

on M34

M34

M34

M34 cored

cored

cored

cored jack

jack

jack

jack

.................................................. 7

5.1.2

5.1.2

5.1.2

5.1.2 Definition

Definition

Definition

Definition of

of

of

of signal

signal

signal

signal lines

lines

lines

lines at

at

at

at V.35

V.35

V.35

V.35 interface

interface

interface

interface

...........................................................................7

5.2

5.2

5.2

5.2 Standard

Standard

Standard

Standard V.35

V.35

V.35

V.35 crossover

crossover

crossover

crossover cable

cable

cable

cable connection

connection

connection

connection diagram

diagram

diagram

diagram

.......................................................... 8

5.3

5.3

5.3

5.3 Sittings

Sittings

Sittings

Sittings of

of

of

of switch

switch

switch

switch and

and

and

and jumper

jumper

jumper

jumper

................................................................................................... 8

5.3.1

5.3.1

5.3.1

5.3.1 Clock

Clock

Clock

Clock setting

setting

setting

setting

.......................................................................................................................... 8

5.3.2

5.3.2

5.3.2

5.3.2 Phase

Phase

Phase

Phase selection

selection

selection

selection

.......................................................................................................................9

5.3.3

5.3.3

5.3.3

5.3.3 Settings

Settings

Settings

Settings of

of

of

of loopback

loopback

loopback

loopback test

test

test

test and

and

and

and pseudo-random

pseudo-random

pseudo-random

pseudo-random code

code

code

code test

test

test

test

.................................................... 9

5.3.4

5.3.4

5.3.4

5.3.4 Framing/non-framing

Framing/non-framing

Framing/non-framing

Framing/non-framing and

and

and

and time

time

time

time slot

slot

slot

slot settings

settings

settings

settings

.................................................................... 10

6.

6.

6.

6. Common

Common

Common

Common Problems

Problems

Problems

Problems

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

 


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MODEL7304 User Manual

Page 3 of 11

1.

1.

1.

1. Introduction

Introduction

Introduction

Introduction

MODEL7304 is a high-performance V.35 optic fiber modem developed by using a dedicated
integrated circuit. It is to modulate a N×64K V.35 data signal directly over single- or
multi-mode optic fiber for a transmission via optic cable line. At another end of the optic
cable, optical signal is demodulated into a V.35 data signal. V.35 interface may be directly
connected with the V.35 interfaces of image and data terminals or the WAN ports of MUX,
exchanger and router for a dedicated network setup or a LAN connection.

2.

2.

2.

2. Product

Product

Product

Product Features

Features

Features

Features

Rate N×64Kbit/s (N=1

32)

Support the loopback of local analog/digital interface

Support remote loopback function

Support pseudo-random code test function

120km trunking -free transmission distance for single-mode optic fiber

Capable to be communicated with FE1 Fiber Modem

Available with complete line detection and alarm indications

Available

with

independent

structure

and

19-inch

Rack-mountable

structure

Rack-mountable structure can be inserted with 16 modules

AC 220V and DC –48V inputs may be selected for fiber optic modems of both structure

For Rack-mountable fiber optic modems, dual power supply heat backup is provided to
ensure a high operating reliability

3

3

3

3.... Specification

Specification

Specification

Specifications

s

s

s

Optic

Optic

Optic

Optic interface:

interface:

interface:

interface:

Line mode type: CMI

Line mode rate: 2.048Mbps

Operating wavelength:850nm,1310nm or 1550nm

Optic fiber connector: SC/PC

Applicable optic fiber: multi-mode, single-mode

Transmission distance:

Single-mode: up to 120km Multi-mode: up to 2km

V.35

V.35

V.35

V.35 interface

interface

interface

interface

Data rate: N×64Kbps

N=1~32

Available with CTS/RTS (Hardware) flow control function

Type of connector: M34 connector

Operating mode: DCE

Indicator lamps: To indicate the operating status of power supply, data receiving/sending,

loopback and random code test, code missing alarm, out-of-frame alarm
etc.

Structure

Structure

Structure

Structure

Independent: 140mm(depth) x 210mm(width) x 42mm(height)

 


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MODEL7304 User Manual

Page 4 of 11

Rack-mountable:

19in 4.5U standard casing

Power

Power

Power

Power supply

supply

supply

supply

Independent:85V

264V AC input, 5V/2A output

-36V

-72V DC input , 5V/2A output

Rack-mountable:150V

260V AC input,5V/16A ,12V/1A output

-38V

-58V DC input,5V/16A ,12V/1A output

Power consumption: 3W
Operating temperature: 0° C

50° C

Storage temperature:

-20° C

80° C

Humidity: 5%

90% (free of condensate)

4.

4.

4.

4. Description

Description

Description

Description on

on

on

on Installation

Installation

Installation

Installation and

and

and

and Panels

Panels

Panels

Panels

4

4

4

4.1

.1

.1

.1 Unpacking

Unpacking

Unpacking

Unpacking::::

After the equipment is unpacked, a check shall be done for the completeness. If any part

is found missing, please immediately contact our representative offices or agents. Complete
packing shall include the following items (for an independent product):

One set of V.35 Fiber Modem MODEL7304

One V.35 Fiber Modem Operation Manual

One power line(V.35 Fiber Modem/AC)

Please also contact our representative offices or agents for any transportation damage

found with this product.

4

4

4

4....2

2

2

2 Front/Rear

Front/Rear

Front/Rear

Front/Rear panels

panels

panels

panels of

of

of

of the

the

the

the stand

stand

stand

stand alone

alone

alone

alone device

device

device

device::::

F

F

F

Front

ront

ront

ront panel

panel

panel

panel

Front

Front

Front

Front Panel

Panel

Panel

Panel of

of

of

of MODEL7304

MODEL7304

MODEL7304

MODEL7304

POWER

Power supply indicator lamp. Constantly lightening after the machine is turned on.

RXD

Data receiving indictor lamp at V.35 interface. Flash indicates that there is data output

from V3.5 interface. The quicker it flashes, the higher rate of data output from
V3.5interface.

TXD

Data sending indictor lamp at V.35 interface. Flash indicates that there is data input to

V3.5 interface. The quicker it flashes, the higher rate of data input to V3.5interface

LOF

E1 Alarm indicator lamp of input signal out-of-frame in optic line. Constantly
lightening indicates the alarm with local device; flash indicates the alarm with
opposite device. Alarm status of opposite device can be detected only at framing
mode.

LOS

E1 Alarm indicator lamp for code missing in optic line. Constantly lightening indicates

the alarm with local device. Flash indicates the alarm with opposite device.

LOOP

Indicator lamp of loopback test status. When local device is at a loopback status, the

 


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MODEL7304 User Manual

Page 5 of 11

lamp flashes. When local device is not at a framing mode, it is unable to detect
whether opposite device is at a loopback test status.

PTOK

Indicator lamp of pseudo-random code test. When the device is at a loopback status,

pseudo-random code test can be made. If this lamp is constantly lightening, it
indicates that pseudo-random code passes the test.

R

R

R

Rear

ear

ear

ear panel

panel

panel

panel

Rear

Rear

Rear

Rear Panel

Panel

Panel

Panel of

of

of

of MODEL7304

MODEL7304

MODEL7304

MODEL7304/AC

/AC

/AC

/AC

220V AC

AC power jack.

OFF ON

Power switch. When the ON button is pressed down, the power supply is turned

on.

V.35: V.35 interface, with a M34 cored jack.
TX RX : Receiving/sending jack of optical fiber, with TX as the sending terminal and RX as

the receiving terminal.

There is a coded switch S5 on the panel, which is used as the system configuration switch

to set such functions as clock, time slot, phase, loopback and pseudo-random code test etc.

Wherein, S5.1 and S5.2 are clock settings.

S5.1

OFF, S5.2=OFF

network clock at V.35 interface(Received Recovered).

S5.1

OFF

S5.2

ON

network clock at the optic fiber interface (Received Recovered).

Remote time slot setting can be tracked only at this status.

S5.1=ON, S5.2=OFF: invalid
S5.1

ON

S5.2

ON

using local crystal OSC generating clock

S5.3: time slot setting

S5.3

OFF

using remote time slot setting (valid only when S5.1

OFF

S5.2

ON)

S5.3

ON

using local time slot setting

S5.4: for V.35 receiving clock phase selection

S5.4=OFF, using positive phase
S5.4=ON, using negative phase

S5.5: Local loopback setting (optic interface in direct loopback), ON valid.
S5.6: Local digital loopback (V.35 interface loopback), ON valid.
S5.7: Remote digital loopback (V.35 interface loopback), ON valid.

Valid at framing mode (0 time slot unused).

S5.8: Pseudo-random code test, ON valid, and valid at loopback status.

MODEL7304

MODEL7304

MODEL7304

MODEL7304 bottom

bottom

bottom

bottom coded

coded

coded

coded switch

switch

switch

switch

B

B

B

Bottom

ottom

ottom

ottom Coded

Coded

Coded

Coded Switch

Switch

Switch

Switch

After time slot 0 is valid, other coded switches in whatever positions are all valid.

 


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MODEL7304 User Manual

Page 6 of 11

Select the number of time slots according to the expected rate. Normally for an independent

type, a time slot setting of automatic tracking Central Site module is selected. Coded switches
of plate-clip time slot correspond to S1, S2, S3 and S4.

Rear

Rear

Rear

Rear Panel

Panel

Panel

Panel of

of

of

of MODEL7304

MODEL7304

MODEL7304

MODEL7304/DC

/DC

/DC

/DC

48V DC

DC -48V power supply connector

The others are the same as AC Rear Panel

4

4

4

4....3

3

3

3 Front/Rear

Front/Rear

Front/Rear

Front/Rear panels

panels

panels

panels of

of

of

of Rack-mountable

Rack-mountable

Rack-mountable

Rack-mountable casing

casing

casing

casing::::

RACK

RACK

RACK

RACK front

front

front

front panel

panel

panel

panel

Front

Front

Front

Front Panel

Panel

Panel

Panel of

of

of

of RACK

RACK

RACK

RACK

+5V: 5V main power supply indicator lamp

+12V: 12V fan power supply indicator lamp

Under the panel is a group of indicator lamps matrix:

PWR : power supply lamp
RXD : lightening upon data receiving at V.35
TXD : lightening upon data sending from V.35
LOS : lightening when the optic line gets lost
LOF : lightening after a synchronization of data out-of-frame
TEST : lightening during loopback test (equivalent to LOOP)
PTOK: lightening after a successful pseudo-random code test

RACK/AC

RACK/AC

RACK/AC

RACK/AC AC

AC

AC

AC redundancy

redundancy

redundancy

redundancy power

power

power

power supply

supply

supply

supply panel

panel

panel

panel

RACK/AC

RACK/AC

RACK/AC

RACK/AC AC

AC

AC

AC Redundancy

Redundancy

Redundancy

Redundancy Power

Power

Power

Power Supply

Supply

Supply

Supply Panel

Panel

Panel

Panel

160~270 VAC

AC 220V input jack

ON OFF

power switch

+5V

5V main power supply indicator lamp

+12V

12V fan power supply indicator lamp

 


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MODEL7304 User Manual

Page 7 of 11

RACK/DC

RACK/DC

RACK/DC

RACK/DC DC

DC

DC

DC redundancy

redundancy

redundancy

redundancy power

power

power

power supply

supply

supply

supply panel

panel

panel

panel

RACK/DC

RACK/DC

RACK/DC

RACK/DC DC

DC

DC

DC Redundancy

Redundancy

Redundancy

Redundancy Power

Power

Power

Power Supply

Supply

Supply

Supply Panel

Panel

Panel

Panel

40~60 VDC

DC-48V input connector (FG grounded, with“- +” terminals connected with

48V input)

ON OFF

power switch

+5V

5V main power supply indicator lamp

+12V

12V fan power supply indicator lamp

5

5

5

5.... MODEL7304

MODEL7304

MODEL7304

MODEL7304 Application

Application

Application

Application

5.1

5.1

5.1

5.1 Definition

Definition

Definition

Definition of

of

of

of signal

signal

signal

signal lines

lines

lines

lines at

at

at

at V.35

V.35

V.35

V.35 interface

interface

interface

interface

5.1.1

5.1.1

5.1.1

5.1.1 Distribution

Distribution

Distribution

Distribution diagram

diagram

diagram

diagram of

of

of

of guiding

guiding

guiding

guiding feet

feet

feet

feet on

on

on

on M34

M34

M34

M34 cored

cored

cored

cored jack

jack

jack

jack

Distribution

Distribution

Distribution

Distribution diagram

diagram

diagram

diagram of

of

of

of guiding

guiding

guiding

guiding feet

feet

feet

feet on

on

on

on M34

M34

M34

M34 cored

cored

cored

cored jack

jack

jack

jack

5.1.2

5.1.2

5.1.2

5.1.2 Definition

Definition

Definition

Definition of

of

of

of signal

signal

signal

signal lines

lines

lines

lines at

at

at

at V.35

V.35

V.35

V.35 interface

interface

interface

interface

As shown:(Operating mode

DCE)

Definition

Definition

Definition

Definition of

of

of

of Signal

Signal

Signal

Signal Lines

Lines

Lines

Lines at

at

at

at V.35

V.35

V.35

V.35 Interface

Interface

Interface

Interface

V.35 Feet

Signal

Function

Direction

A

CGND

Frame ground

——

B

GND

signal ground

——

C

RTS

request to send

input

D

CTS

consent to send

output

E

DSR

data set ready

output

F

DCD

data carrier detection output

H

DTR

data terminal ready

input

P

TXD A

transmitting

data

line A

input

S

TXD B

transmitting

data

line B

input

R

RXD A

receiving data line A

output

 


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MODEL7304 User Manual

Page 8 of 11

5.2

5.2

5.2

5.2 Standard

Standard

Standard

Standard V.35

V.35

V.35

V.35 crossover

crossover

crossover

crossover cable

cable

cable

cable connection

connection

connection

connection diagram

diagram

diagram

diagram

V.35 feet

V.35 feet

CGND

A

—————

A

CGND

GND

B

—————

B

GND

RTS

C

—————

D

CTS

CTS

D

—————

C

RTS

DSR

E

—————

H

DTR

DTR

H

—————

E

DSR

TXDA

P

—————

R

RXDA

TXDB

S

—————

T

RXDB

RXDA

R

—————

P

TXDA

RXDB

T

—————

S

TXDB

EXCA

U

—————

V

RXCA

EXCB

W

—————

X

RXCB

RXCA

V

—————

U

EXCA

RXCB

X

—————

W

EXCB

5.3

5.3

5.3

5.3 Sittings

Sittings

Sittings

Sittings of

of

of

of switch

switch

switch

switch and

and

and

and jumper

jumper

jumper

jumper

Independent device has totally 5 setting switches, with S5 located on the rear panel and

S1~S4 under the bottom cover. The user can easily make settings without the need to open the
cover.

5.3.1

5.3.1

5.3.1

5.3.1 Clock

Clock

Clock

Clock setting

setting

setting

setting

V.35 interface timing (S5.1= OFF, S5.2=OFF): the sending timing is V.35 port timing, and

the received data, after buffering, is synchronized with V.35 port timing.

Optic interface receiving timing (optic interface originated from the clock, S5.1=OFF

S5.2=ON): the sending timing is optic interface receiving timing, and the received data, after
buffering, is synchronized with optic interface receiving timing. Under this timing mode, local
time slot setting can automatically track the opposite time slot setting.

T

RXD B

receiving data line B

output

U

EXTCLK
A

exterior clock line A

input

W

EXTCLK
B

exterior clock line B

input

V

RXCL A

receiving clock line
A

output

X

RXCL B

receiving clock line
B

output

Y

TXCL A

transmitting

clock

line A

output

AA

TXCL B

transmitting

clock

line B

output

 


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MODEL7304 User Manual

Page 9 of 11

Local main timing (S5.1=ON, S5.2=ON): the sending timing is of local crystal OSC, and

the received data, after buffering, is synchronized with local timing.

5.3.2

5.3.2

5.3.2

5.3.2 Phase

Phase

Phase

Phase selection

selection

selection

selection

S5.4 is used for the receiving phase selection of V.35 interface.

5.3.3

5.3.3

5.3.3

5.3.3 Settings

Settings

Settings

Settings of

of

of

of loopback

loopback

loopback

loopback test

test

test

test and

and

and

and pseudo-random

pseudo-random

pseudo-random

pseudo-random code

code

code

code test

test

test

test

S5.5

S5.8 of coded switch S5 are used for setting the loopback test and pseudo-random

code test.
S5.5 is local loopback control

LLOOP

and optic interface is directly looped back to

V.35 interface. “OFF” indicates normal operation; “ON” indicates local loopback test.
The default is “OFF”. It is used for testing whether local device is in normal operation.

Local

Local

Local

Local Loopback

Loopback

Loopback

Loopback Schematic

Schematic

Schematic

Schematic

S5.6: local digital loopback control (DLOOP). “OFF” indicates normal operation; “ON”

indicates local digital loopback. The default is “OFF”. With a loopback from local V.35
interface to E1 optic interface, it is used for testing whether the remote device and E1
optic line are in normal operation.

Local

Local

Local

Local Digital

Digital

Digital

Digital Loopback

Loopback

Loopback

Loopback

S5.7:“OFF”indicates normal operation

“ON”indicates command remote loopback. The

default is “OFF”. As this command must be sent through E1 optic line to remote end for
validness, it will become invalid at the following two cases:

the remote end is not

V.35 Fiber Modem device;

V.35 Fiber Modem is working at a non-framing status, at

this moment all time slots of E1 are used for transmitting the data from V.35 interface at
a rate of 2048Kbps. Through a transmission of loopback command from local device to
remote device, the command remote loopback is achieved.

Remote

Remote

Remote

Remote Loopback

Loopback

Loopback

Loopback

S5.8: Pseudo-random code test control (PATT). “OFF” indicates normal operation; “ON”

indicates pseudo-random sequence test. The default is “OFF”. It generates a
pseudo-random sequence code to be transmitted to V.35 optic line output terminal and
tests whether V.35 optic line input signal is in compliance with this sequence standard,
so as to judge whether the device and line transmission have an error code.

V.3 5

Fiber Modem V3 5

Optical 

Interface

Fiber Modem V3 5

Optical 

Interface

V.3 5

Fiber Modem V3 5

V.3 5

V.3 5

Fiber Modem V3 5

Fiber Link

R em ote

Local

 


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MODEL7304 User Manual

Page 10 of 11

pseudo-random

pseudo-random

pseudo-random

pseudo-random Code

Code

Code

Code Test

Test

Test

Test

Remark:

Remark:

Remark:

Remark:

Pseudo-random sequence code test can be made only under a loopback status. At

this moment, constantly lightening of LOOP and PTOK/CRC lamps shows local status, flash
shows remote status; TXD and RXD lamps are used for showing the status of local TXD or
RXD.

5.3.4

5.3.4

5.3.4

5.3.4 Framing/non-framing

Framing/non-framing

Framing/non-framing

Framing/non-framing and

and

and

and time

time

time

time slot

slot

slot

slot settings

settings

settings

settings

Totally 32 coded switches S1, S2, S3 and S4 are used for E1 time slot setting.

E1

E1

E1

E1 Time

Time

Time

Time Slot

Slot

Slot

Slot Setting

Setting

Setting

Setting

1

st

switch (S1.1) is used for controlling E1 framing/non-framing. “ON” refers to

non-framing mode.

31 switches, from 2

nd

—32

nd

(S1.2~S1.8, S2, S3, S4), are respectively used for controlling

the selection of 1

st

–31

st

time slots. Set at “ON”, the corresponding time slot is selected;

set at “OFF”, the corresponding time slot is not selected. The rate of V.35 interface is
completely dependent on the number of the selected time slots. For example: the setting
of 3

rd

switch to “ON” and all other switches to “OFF” indicates that 2

nd

time slot is

selected, at this moment the rate is 64K; the setting of 7

th

and 8

th

switches to “ON” and all

other switches to “OFF” indicates that 6

th

and 7

th

time slots are selected, with a rate of

2×64K=128K. TS0 setting is used for specifying E1 frame to be transparent or framing:
“0”--framing, “1”--non-framing. But the bit has to be specified in combination with other
time slots. TS16 setting is used for controlling E1 frame structure to be PCM30

CAS

or PCM31

CCS

: ‘0’—PCM30, at this moment 16

th

time slot must not be used for

transmission service; ‘1’—PCM31, 16

th

time slot can be used for transmission service.

Besides, TS1—TS31 are respectively used for controlling the selection of 1

st

—31

st

time

slots: ‘1’—the corresponding time slot is selected; ‘0’—the corresponding time slot is not
selected.

Typical application

Non-framing mode: 1

st

switch is set to “ON”, and all other switches

to “OFF” (other switches are located in such a way that the setting of non-framing is
unaffected) Framing mode: 1st switch is set to “OFF”, and all other switches are set
according to the time slot positions to be used by E1 channel and the rate of V.35 port. (If
it is set to tracking remote time slot, the time slot switch will become invalid)

Attention:

Attention:

Attention:

Attention:

Ex-works S1, S2, S3 and S4 are all set to “OFF”

Attention:

Attention:

Attention:

Attention:

The setting of tracking remote time slot; S5.2 to “ON”; S5.1 and S5.3 to “OFF”

V.3 5

V.3 5

Fiber Modem V3 5

Fiber Modem V3 5

Local

R em ote

Fiber Link

 


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MODEL7304 User Manual

Page 11 of 11

6.

6.

6.

6. Common

Common

Common

Common Problems

Problems

Problems

Problems

Common

Common

Common

Common Failures

Failures

Failures

Failures and

and

and

and Solutions

Solutions

Solutions

Solutions

No.

Failure

Cause

Solution

1

PWR

power

supply

indicator

lamp

not

lightening

1.Power supply not properly

connected

2.Protector tube damaged

3. -48V DC input tie-line in

reverse connection

4.Internal power supply circuit

with failure

1.Check

power

switch

and

jack

2.Replace protector tube 3.Correct -48V

power supply line connection

4.Returned to the manufacturer for

repair.

2

LOF

out-of-frame

alarm lamp lightening

1.Optic interface not clean

2.Optic fiber not well inserted

3.Wrong clock setting

4.Time slots of the devices at

two ends not conformance

5.Internal circuit damaged

1. Clean the connector of optic interface

2. Insert the SC connector in place

3. Refer to the description on rear panel

4. Returned to the manufacturer for

repair.

3

LOS data loss alarm

lamp lightening

1.

Optic

fiber

in

wrong

interconnection

2.Optic fiber not well inserted

3.Optic fiber broken

4.Internal circuit damaged

1. Correct the connection

2. Insert the SC connector in place

3. Check optic cable

4. Returned to the manufacturer for

repair.

4

TXD

lamp

not

lightening

V.35

interface

not

well

connected or the router etc. not

turned on.

1.

Check

the

connecting

line

and

terminal device