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3Com CoreBuilder 3500 Installation Manual

CoreBuilder 9000 CoreBuilder 9400 3CB9LF20R - CoreBuilder 9000 100BTX Switching Module Expansion 3CGBIC91 3CGBIC92 3CGBIC97

Made by: 3Com
Type: Installation Guide
Category: Transceiver
Pages: 12
Size: 0.15 MB

 

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70-km Gigabit Ethernet 
GBIC Transceiver 
Installation Guide

For 3Com Gigabit Interface Converter (GBIC) Transceivers

Description

The Gigabit Interface Converter (GBIC) ports on your system connect to 
Gigabit Ethernet networks through a GBIC transceiver (Figure 1), 
providing a high-speed connection over fiber-optic cable. The transceiver 
connects to the network using a fiber-optic duplex Subscriber Connector 
(SC). You can remove and replace the transceiver with the system on 
(which is called hot-swapping).

Figure 1   70-km Gigabit Ethernet GBIC Fiber-Optic Transceiver

To ensure optimal performance, compatibility, and regulatory compliance, 
use only GBIC transceivers that 3Com supports. For a list of currently 
supported GBICs, see this 3Com Web site:

http://www.3Com.com/gigabit_ethernet/gbics

For the most up-to-date information about this and other 3Com 
products, always see the User Guides and Release Notes at this 3Com 
Web site:

http://support.3Com.com/nav/switches.htm

 


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2

70-km Gigabit Ethernet GBIC Transceiver Installation Guide

Table 1 shows the transmission range and other data for this connection.

Table 2 shows the optical parameters of the 

70-km Gigabit Ethernet GBIC.

Safety Precautions

Be sure to follow all safety precautions when you replace a GBIC 
transceiver in the system. To avoid electric shocks and burns to yourself 
and damage to the equipment, read and follow these warnings:

WARNINGS: When the system is on:

Never insert a metal object such as a screwdriver or a finger with 
jewelry into open module slots.

Do not touch any connections inside the chassis with your hands or 
fingers.

Fiber Safety Precautions

The GBIC ports on your system use lasers. To ensure your safety when you 
install or work with these GBIC systems, read and comply with the 
precautions in this section.

Table 1   70-km Gigabit Ethernet GBIC Single-Mode Transmission Range

Fiber Type

Diameter 
(microns)

Minimum 
Connector End 
Polish

Transmission Range

Single-mode

9

µ

m core

PC

10 – 70 km (6.2 – 43.4 mi)

Table 2   Optical Parameters

Parameter

Symbol Min

Typ

Max

Units

Notes/Conditions

Transmitter

Wavelength

λ

c

1540

1550

1570

nm

Optical output 
power

P

out

–4

N/A

N/A

dBm

Average power 
coupled into 
single-mode fiber

Receiver

Optical input 
power

P

in

–24

N/A

N/A

dBm

BER< 10

-12

 with 

PRBS 2

7

 –1 test data 

pattern 
@ 1.25Gb/s

 


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70-km Gigabit Ethernet GBIC Transceiver Installation Guide

3

WARNING: The fiber optic lasers used in 3Com GBIC ports meet the 
regulatory requirements for casual exposure to the eye. As with any 
source of bright light, however, 3Com recommends that you do not look 
into the laser light source.

FDA Class 1 Laser Device 

This product complies with U.S. Department of Health and Human 
Services Rules 21 CFR Subchapter J applicable at date of manufacture.

IEC 825, Class 1 Laser Devices are for connection only to Class 1 Laser 
Devices. Multimode and single-mode fiber optic interfaces use lasers.

Inserting the

Transceiver

Before you connect the system to the Gigabit Ethernet network, first 
insert the transceiver into the GBIC port on the system, as described in 
this section. The procedure is similar for all relevant CoreBuilder

®

 chassis.

To ensure optimal performance, compatibility, and regulatory compliance, 
use only GBIC transceivers that 3Com supports. For a list of GBIC devices 
that are qualified for the CoreBuilder 3500, 9000, and 9400, see this 
3Com Web site:

http://www.3com.com/gigabit_ethernet/gbics

Read and follow the instructions in “Safety Precautions” earlier in this 

guide.

Orient the transceiver so that the duplex SC connector is toward you. 

CAUTION: GBIC transceivers are keyed and can be properly inserted only 
one way. If the transceiver does not click when you insert it, turn it over 
and reinsert it.

Figure 2 shows how to insert the transceiver into a CoreBuilder 3500 

GBIC port. 

Figure 3 shows how to insert the transceiver into a GBIC port on the 

CoreBuilder 9000 7-slot chassis. Installation in the 8-slot and 16-slot 
chassis is the same except that the chassis ports are oriented vertically.

CLASS 1

LASER PRODUCT

 


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4

70-km Gigabit Ethernet GBIC Transceiver Installation Guide

Figure 2   Inserting the 70-km GBIC Transceiver in a CoreBuilder 3500

Figure 3   Inserting the 70-km GBIC Transceiver in a CoreBuilder 9000

C

1000 BASE (GBIC)
3C35330

PWR

INS

ERR

L

E
T

INS

MODEM

TERMINAL

ETHERNET
     10BT

1000BASE GBIC module

GBIC port

Duplex SC connector

R

M

O

D

  S

TA

T

1

2

2

3

4

1

RX

TX

RX

TX

R

PR

I

M

OD

  S

TA

T

SE

C

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

PR

I

M

OD

  S

TA

T

SE

C

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

P

R

I

M

O

D

  S

TA

T

S

E

C

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

5

6

7

8

9

GEN Interface

module

GBIC port

Duplex SC
connector

 


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70-km Gigabit Ethernet GBIC Transceiver Installation Guide

5

Gently slide the transceiver into the GBIC port until it clicks into place. 

CAUTION: GBIC transceivers are keyed and can be properly inserted only 
one way. If the transceiver does not click when you insert it, turn it over 
and reinsert it.

You are now ready to cable the system to the Gigabit Ethernet network.

Removing the Transceiver

To replace an existing GBIC transceiver, compress the side tabs and gently 
pull the old transceiver out of the port.

Troubleshooting

Transceivers

After you insert the GBIC transceiver into the port, the system software 
verifies the transceiver operation, as discussed in this section.

To ensure optimal performance, compatibility, and regulatory compliance, 
use only GBIC transceivers that 3Com supports. For a list of currently 
supported GBICs, see this 3Com Web site:

http://www.3com.com/gigabit_ethernet/gbics

If the transceiver is not working properly, the system displays an 
appropriate error message, as described in the following sections.

“Unqualified GBIC” Error

If the system detects an unqualified GBIC or a problem with the integrity 
of the GBIC, it sets the port type to 

Unqualified GBIC

, displays a short 

description at the display (

Uqual.GBIC

), and captures the error in the 

event log.

WARNING 

The GBIC in Port xx is NOT approved by 3Com & may violate 

electromagnetic emission or safety requirements for your 

country. Refer to 3Com's web page 

(www.3com.com/gigabit_ethernet/gbics) for our current 

approved list.

Using a newer version GBIC transceiver (GBIC91, GBIC92, or GBIC97) in a 
system running older code (pre-Release 3.0) can generate the above 
message. For a list of GBIC devices that are qualified for the CoreBuilder

 

3500, 9000, and 9400, see this 3Com Web site:

http://www.3com.com/gigabit_ethernet/gbics

 


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6

70-km Gigabit Ethernet GBIC Transceiver Installation Guide

The event log may show one of the following informational messages:

Unqualified GBIC: I2C read error

Meaning

The transceiver, which connects to the module host board through a 
20-pin connector is not seated properly, and a clean connection 
cannot be established.

Corrective action

To correct this problem, completely remove the transceiver and then 
reinsert it. If the problem persists, contact 3Com Technical Support. 
For contact information in the United States and Canada, call 
1-800-NET-3COM. For the number to call in other locations, visit the 
3Com Web site: 

http://www.3com.com/util/enterprise.html

Unqualified GBIC: Checksum match error

Meaning

The system uses checksum error detection to verify the integrity of the 
GBIC data. If the system detects a problem with the data, it displays 
an error message that indicates a checksum failure. 

Corrective action

Although this condition does not necessarily indicate that the GBIC 
transceiver will not function in the system, replace the transceiver to 
ensure proper operation. 

Unqualified GBIC: MODDEF Value – xx 

Unqualified GBIC: Transceiver byte(s) error

Meaning

For both of these messages, the value (

xx

) of this GBIC type is not a 

Module Definition 4 GBIC (Serial Identification) as defined by the 
Gigabit Interface Converter specification. 

Corrective action

Replace this transceiver with a GBIC that is qualified by 3Com.

 


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70-km Gigabit Ethernet GBIC Transceiver Installation Guide

7

GBIC Disable Error

If the system detects that the transceiver cannot emit the proper laser 
signal, it disables the port, sets the port type to 

disabled

, displays a short 

description (

GBIC Disable

), and captures the error in the event log.

The following message appears in the event log:

Due to excessive TxFault conditions, GBIC Port xx has been 

disabled.

Meaning

Excessive Tx Fault conditions indicate a faulty GBIC. 

Corrective action

Replace the transceiver. If the problem persists, contact network supplier 
or 3Com Technical Support. For contact information, see the Technical 
Support appendix in the Getting Started Guide for your system.

“Unapproved GBIC” Error

Supported transceivers are those that 3Com has specifically tested and 
qualified for use with 3Com GBIC systems. Pretesting at 3Com ensures 
proper functionality, compatibility, and regulatory compliance. 

If the system detects a transceiver that 3Com does not support, it sets the 
port type to 

Unqualified GBIC,

 displays a short description, 

(

Unappr.GBIC

), and captures the error in the event log.

WARNING 

The GBIC in Port xx is NOT approved by 3Com & may violate 

electromagnetic emission or safety requirements for your 

country. Refer to 3Com's web page 

(www.3com.com/gigabit_ethernet/gbics) for our current 

approved list.

The following informational message is shown in the event log:

Unqualified GBIC: Unqualified vendor part number

Corrective action

Although this report does not necessarily indicate that the GBIC 
transceiver will not function properly with the system, it does indicate 
that 3Com has not qualified the transceiver and does not support it.

 


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8

70-km Gigabit Ethernet GBIC Transceiver Installation Guide

Incorrect Value in the Ethernet Display Field (CoreBuilder 3500)

An incorrect value appears in the Ethernet display field when all of these 
conditions are true:

Your CoreBuilder 3500 is running system software at Release 2.1 or 
earlier.

You have installed or reinstalled a new or replacement GBIC (for 
example, Model Number 3CGBIC91, 3CGBIC92 or 3CGBIC97).

You enter the 

ethernet summary

 or the 

ethernet detail

 command 

for the first time.

When all of these conditions are true, the text 

(GBIC) Non-qualified

 

appears in the 

portType

 field of the Ethernet display even though the 

GBIC is qualified and functions properly. Disregard this incorrect value.

Calculating the Link

Budget for the 70-km

GBIC Transceiver

The 70-km GBIC has an optical budget of 20 dB and operates at a 
wavelength of 1550 nm. Calculate potential link distances as follows:

Minimum launch power is –4 dBm.

Minimum receive sensitivity is –24 dBm.

The optical budget is arrived at by subtracting the minimum receive 
sensitivity of –24 dBm from the minimum launch power of –4 dBm, 
which yields an optical budget of 20 dB.

Allow 0.25 dB attenuation per kilometer of single-mode fiber at 
1550 nm.

Allow 0.5 dB attenuation per mating connector.

 


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70-km Gigabit Ethernet GBIC Transceiver Installation Guide

9

Sample Calculations

System A

60 km of fiber with 8 mating connectors:

1

60 km of single-mode fiber 

x 0.25 dB per km 
= 15 dB fiber attenuation

2

8 mating connectors 

x 0.50 dB per connector 
= 4 dB connector attenuation

3

15 dB fiber attenuation 

+ 4 dB connector attenuation 
= 19 dB total link attenuation

System B

75 km of fiber with 2 mating connectors:

1

75 km of single-mode fiber 

x 0.25 dB per km 
= 18.75 dB fiber attenuation

2

2 mating connectors 

x 0.50 dB per connector 
= 1 dB connector attenuation

3

18.75 dB fiber attenuation 

+ 1dB connector attenuation 
= 19.75 dB total link attenuation

System C

90 km of fiber with 4 mating connectors:

1

90 km of single-mode fiber 

x 0.19 dB per km 
= 17.1 dB fiber attenuation

2

4 mating connectors 

x 0.5 dB per connector 
= 2 dB connector attenuation

3

17.1 dB fiber attenuation 

+ 2 dB connector attenuation 
= 19.1 dB total link attenuation

 


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10

70-km Gigabit Ethernet GBIC Transceiver Installation Guide

The budget figures for all three of the sample systems reflect conservative 
values for fiber attenuation and connector attenuation to assure 
operation at 70 km under typical to less-than-ideal conditions. Link 
distances of greater than 70 km can be attained when conditions allow. 
Fiber attenuation of 0.19 dB per km and lower is possible, allowing link 
lengths beyond 70 km. Consult your fiber installer to obtain actual link 
attenuation values at 1550 nm for the fiber intended for use with the 
70-km GBIC transceiver.

 


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3Com Corporation L

IMITED

 W

ARRANTY

3Com GBIC Transceivers

H

ARDWARE

3Com warrants to the end user (“Customer”) that this hardware product will be free from defects in workmanship 
and materials, under normal use and service, for one (1) year from the date of purchase from 3Com or its authorized 
reseller.

3Com’s sole obligation under this express warranty shall be, at 3Com’s option and expense, to repair the defective 
product or part, deliver to Customer an equivalent product or part to replace the defective item, or if neither of the 
two foregoing options is reasonably available, 3Com may, in its sole discretion, refund to Customer the purchase 
price paid for the defective product. All products that are replaced will become the property of 3Com. Replacement 
products may be new or reconditioned. 3Com 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.

Y

EAR

 2000 W

ARRANTY

In addition to the Hardware Warranty and Software Warranty stated above, 3Com warrants that each product sold 
or licensed to Customer on and after January 1, 1998, that is date sensitive will continue performing properly with 
regard to such date data on and after January 1, 2000, provided that all other products used by Customer in 
connection or combination with the 3Com product, including hardware, software, and firmware, accurately 
exchange date data with the 3Com product, with the exception of those products identified at 3Com’s Web site, 
http://www.3com.com/products/yr2000.html, as not meeting this standard. If it appears that any product that is 
stated to meet this standard does not perform properly with regard to such date data on and after January 1, 2000, 
and Customer notifies 3Com before the later of April 1, 2000, or ninety (90) days after purchase of the product from 
3Com or its authorized reseller, 3Com shall, at its option and expense, provide a software update which would effect 
the proper performance of such product, repair such product, deliver to Customer an equivalent product to replace 
such product, or, if none of the foregoing is feasible, refund to Customer the purchase price paid for such product. 

Any software update or replaced or repaired product will carry a Year 2000 Warranty for ninety (90) days after 
purchase or until April 1, 2000, whichever is later. 

O

BTAINING

 W

ARRANTY

 

S

ERVICE

Customer must contact a 3Com Corporate Service Center or an Authorized 3Com Service Center within the 
applicable warranty period to obtain warranty service authorization. Dated proof of purchase from 3Com or its 
authorized reseller may be required. Products returned to 3Com’s Corporate Service Center must be preauthorized 
by 3Com with a Return Material Authorization (RMA) number or User Service Order (USO) number marked on the 
outside of the package, and sent prepaid and packaged appropriately for safe shipment, and it is recommended that 
they be insured or sent by a method that provides for tracking of the package. Responsibility for loss or damage does 
not transfer to 3Com until the returned item is received by 3Com. The repaired or replaced item will be shipped to 
Customer, at 3Com’s expense, not later than thirty (30) days after 3Com receives the defective product.

3Com shall not be responsible for any software, firmware, information, or memory data of Customer contained in, 
stored on, or integrated with any products returned to 3Com for repair, whether under warranty or not.

Dead- or Defective-on-Arrival.  In the event a product completely fails to function or exhibits a defect in materials or 
workmanship within the first forty-eight (48) hours of installation but no later than thirty (30) days after the date of 
purchase, and this is verified by 3Com, it will be considered dead- or defective-on-arrival (DOA) and a replacement 
shall be provided by advance replacement. The replacement product will normally be shipped not later than three (3) 
business days after 3Com’s verification of the DOA product, but may be delayed due to export or import procedures.  
The shipment of advance replacement products is subject to local legal requirements and may not be available in all 
locations. When an advance replacement is provided and Customer fails to return the original product to 3Com 
within fifteen (15) days after shipment of the replacement, 3Com will charge Customer for the replacement product, 
at list price. 

Advance Replacement is provided for ninety (90) days, after which time it may be available for a specified fee. 3Com 
will make commercially reasonable efforts to ship the replacement product not later than five (5) business days after 
receiving the request for advance replacement, but may be delayed due to product availability or export or import 
procedures. The shipment of advance replacement products is subject to local legal requirements and may not be 
available in all locations. When an advance replacement is provided and Customer fails to return the original product 
to 3Com within fifteen (15) days after shipment of the replacement, 3Com will charge Customer for the 
replacement, at list price. This advance replacement is different from the fee-based Advance Hardware Replacement 
Service, which is available as a contracted service offering.

INCLUDED SERVICES: 

Telephone Support, with coverage for basic troubleshooting only, will be provided for ninety (90) days from the date 
of purchase, on a commercially reasonable efforts basis. Please refer to the Technical Support appendix in the Getting 
Started Guide for telephone numbers.

3Com’s Web and Bulletin Board Services provide 3Knowledgebase, bug tracking, documentation, release notes, and 
some software maintenance releases at no charge.

 


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W

ARRANTIES

 E

XCLUSIVE

IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY FOR BREACH OF 
THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S 
OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE 
AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR 
BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, SATISFACTORY QUALITY, CORRESPONDENCE WITH 
DESCRIPTION, AND NONINFRINGEMENT, ALL OF WHICH ARE EXPRESSLY DISCLAIMED. 3COM NEITHER ASSUMES 
NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, 
INSTALLATION, MAINTENANCE, OR USE OF ITS PRODUCTS.

3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE 
ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR 
ANY THIRD PERSON’S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO 
OPEN, REPAIR, OR MODIFY THE PRODUCT, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR 
BY ACCIDENT, FIRE, LIGHTNING, POWER CUTS OR OUTAGES, OTHER HAZARDS, OR ACTS OF GOD.

L

IMITATION

 

OF

 L

IABILITY

TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, 
WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, 
INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF 
BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION 
WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS 
PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 
DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 
3COM’S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY 
PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.

D

ISCLAIMER

Some countries, states, or provinces do not allow the exclusion or limitation of implied warranties or the limitation of 
incidental or consequential damages for certain products supplied to consumers, or the limitation of liability for 
personal injury, so the above limitations and exclusions may be limited in their application to you. When the implied 
warranties are not allowed to be excluded in their entirety, they will be limited to the duration of the applicable 
written warranty. This warranty gives you specific legal rights which may vary depending on local law.

G

OVERNING

 L

AW

This Limited Warranty shall be governed by the laws of the State of California, U.S.A., excluding its conflicts of laws 
principles and excluding the United Nations Convention on Contracts for the International Sale of Goods.

3Com Corporation, 5400 Bayfront Plaza, P.O. Box 58145, Santa Clara, CA  95052-8145 (408) 326-5000

3Com Corporation
5400 Bayfront Plaza
Santa Clara, California
95052-8145

Copyright © 2000, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in 
any form or by any means or used to make any derivative work (such as translation, transformation, or 
adaptation) without written permission from 3Com Corporation. 3Com Corporation reserves the right to revise 
this documentation and to make changes in content from time to time without obligation on the part of 
3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied 
or expressed, including, but not limited to, the implied warranties, terms, or conditions of merchantability, 
satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the 
product(s) and/or the program(s) described in this documentation at any time.

3Com registered trademarks are registered in the United States and may or may not be registered in other 
countries. 3Com, the 3Com logo, CoreBuilder, and SuperStack are registered trademarks of 3Com Corporation.

All other company and product names may be trademarks of the respective companies with which they are 
associated.

Part No.10013642
Published February 2000

http://www.3com.com/