3Com CoreBuilder 3500 Bedienungsanleitung
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
270-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.
Ta b l e 1 70-km Gigabit Ethernet GBIC Single-Mode Transmission Range
Fiber Type
Diameter
(microns)
Minimum
Connector End
Polish Transmission Range
Single-mode 9µm core PC 10 – 70 km (6.2 – 43.4 mi)
Ta b l e 2 Optical Parameters
Parameter Symbol Min Typ Max Units Notes/Conditions
Transmitter
Wavelength λc1540 1550 1570 nm
Optical output
power
Pout –4 N/A N/A dBm Average power
coupled into
single-mode fiber
Receiver
Optical input
power
Pin –24 N/A N/A dBm BER< 10-12 with
PRBS 27–1 test data
pattern
@ 1.25Gb/s
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
1Read and follow the instructions in “Safety Precautions” earlier in this
guide.
2Orient 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.
aFigure 2 shows how to insert the transceiver into a CoreBuilder 3500
GBIC port.
bFigure 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
470-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
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T
INS MODEM TERMINAL ETHERNET
10BT
1000BASE GBIC module GBIC port
Duplex SC connector
R
MODSTAT
12
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34
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SEC
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GEN Interface
module
GBIC port
Duplex SC
connector
70-km Gigabit Ethernet GBIC Transceiver Installation Guide 5
3Gently 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.
4You 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
670-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.
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.
870-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.
70-km Gigabit Ethernet GBIC Transceiver Installation Guide 9
Sample Calculations
System A
60 km of fiber with 8 mating connectors:
160 km of single-mode fiber
x 0.25 dB per km
= 15 dB fiber attenuation
28 mating connectors
x 0.50 dB per connector
= 4 dB connector attenuation
315 dB fiber attenuation
+ 4 dB connector attenuation
= 19 dB total link attenuation
System B
75 km of fiber with 2 mating connectors:
175 km of single-mode fiber
x 0.25 dB per km
= 18.75 dB fiber attenuation
22 mating connectors
x 0.50 dB per connector
= 1 dB connector attenuation
318.75 dB fiber attenuation
+ 1dB connector attenuation
= 19.75 dB total link attenuation
System C
90 km of fiber with 4 mating connectors:
190 km of single-mode fiber
x 0.19 dB per km
= 17.1 dB fiber attenuation
24 mating connectors
x 0.5 dB per connector
= 2 dB connector attenuation
317.1 dB fiber attenuation
+ 2 dB connector attenuation
= 19.1 dB total link attenuation
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.
Andere Handbücher für CoreBuilder 3500
3
Dieses Handbuch passt für folgende Modelle
6
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