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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cables
Console Port Mode Switch
The supervisor engine front-panel console port mode switch allows you to connect a terminal or modem 
to the console port as follows:
Mode 1—Switch in the in position. Use this mode to connect a terminal to the console port using 
the RJ-45-to-RJ-45 rollover cable and DTE adapter (labeled “Terminal”). 
You can also use this mode to connect a modem to the console port using the RJ-45-to-RJ-45 
rollover cable and DCE adapter (labeled “Modem”).
See the “Console Port Mode 1 Signaling and Pinouts” section on page A-34.
Mode 2—Switch in the out position. Use this mode to connect a terminal to the console port using 
the Catalyst 5000 family Supervisor Engine III console cable and the appropriate adapter for the 
terminal connection. (The cable and adapter are not provided.) 
See the “Console Port Mode 2 Signaling and Pinouts” section on page A-35.
NoteUse a ballpoint pen tip or other small, pointed object to access the console port mode switch. The switch 
is shipped in the in position.
Identifying a Rollover Cable
You can identify a rollover cable by comparing the two ends of the cable. Holding the cables side by 
side, with the tab at the back, the wire connected to the pin on the outside of the left plug should be the 
same color as the wire connected to the pin on the outside of the right plug. (See Figure A-20.) If your 
cable was purchased from Cisco Systems, pin 1 will be white on one connector, and pin 8 will be white 
on the other. (A rollover cable reverses pins 1 and 8, 2 and 7, 3 and 6, and 4 and 5.) 
Figure A-20 Identifying a Rollover Cable
Pin 1Pin 8
H3824
Pin 1 and pin 8
should be the 
same color 
						

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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cables
Console Port Mode 1 Signaling and Pinouts
This section provides the signaling and pinouts for the console port in mode 1. (The port mode switch is 
in the in position.) 
DB-9 Adapter (for Connecting to a PC)
Use the RJ-45-to-RJ-45 rollover cable and the RJ-45-to-DB-9 female DTE adapter (labeled “Terminal”) 
to connect the console port to a PC running terminal emulation software. Ta b l e A - 2 7 lists the pinouts for 
the asynchronous serial console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-9 female 
DTE adapter.
DB-25 Adapter (for Connecting to a Terminal)
Use the RJ-45-to-RJ-45 rollover cable and the RJ-45-to-DB-25 female DTE adapter (labeled 
“Terminal”) to connect the console port to a terminal. Ta b l e A - 2 8 lists the pinouts for the asynchronous 
serial console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter.
Table A-27 Port Mode 1 Signaling and Pinouts (DB-9 Adapter)
Console Port  RJ-45-to-RJ-45 
Rollover CableRJ-45-to-DB-9 
Te r m i n a l  A d a p t e rConsole
Device
Signal RJ-45 Pin RJ-45 Pin DB-9 Pin Signal
RT S 1
1
1. Pin 1 is connected internally to Pin 8.
88 CTS
DTR 2 7 6 DSR
TxD 3 6 2 RxD
GND 4 5 5 GND
GND 5 4 5 GND
RxD 6 3 3 TxD
DSR 7 2 4 DTR
CTS 8
117 RTS
Table A-28 Port Mode 1 Signaling and Pinouts (DB-25 Adapter)
Console Port RJ-45-to-RJ-45 Rollover Cable  RJ-45-to-DB-25 
Terminal 
AdapterConsole
Device
Signal RJ-45 Pin RJ-45 Pin DB-25 Pin Signal
RT S 1
185 CTS
DTR 2 7 6 DSR
TxD 3 6 3 RxD
GND 4 5 7 GND
GND 5 4 7 GND
RxD 6 3 2 TxD 
						

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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cables
Modem Adapter
Use the RJ-45-to-RJ-45 rollover cable and the RJ-45-to-DB-25 male DCE adapter (labeled “Modem”) 
to connect the console port to a modem. Ta b l e A - 2 9 lists the pinouts for the asynchronous serial auxiliary 
port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter.
Console Port Mode 2 Signaling and Pinouts
This section provides the signaling and pinouts for the console port in mode 2. (The port mode switch 
in the out position.) (See Ta b l e A - 3 0 for the pinouts.) DSR 7 3 20 DTR
CTS 8
114 RTS
1. Pin 1 is connected internally to Pin 8.
Table A-28 Port Mode 1 Signaling and Pinouts (DB-25 Adapter) (continued)
Console Port RJ-45-to-RJ-45 Rollover Cable  RJ-45-to-DB-25 
Te r m i n a l  
AdapterConsole
Device
Signal RJ-45 Pin RJ-45 Pin DB-25 Pin Signal
Table A-29 Port Mode 1 Signaling and Pinouts 
(Modem Adapter)
Console Port  RJ-45-to-RJ-45 
Rollover CableRJ-45-to-DB-25 
Modem AdapterModem
Signal RJ-45 Pin RJ-45 Pin DB-25 Pin Signal
RT S 1
1
1. Pin 1 is connected internally to Pin 8.
84 RTS
DTR 2 7 20 DTR
TxD 3 6 3 TxD
GND 4 5 7 GND
GND 5 4 7 GND
RxD 6 3 2 RxD
DSR 7 3 8 DCD
CTS 8
115 CTS
Table A-30 Port Mode 2 Signaling and Pinouts (Port Mode Switch Out)
Console Port Console Device
Pin (signal) Input/Output 
1 (RTS)
1Output
2 (DTR)  Output
3 (RxD) Input 
						

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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cables
Mode-Conditioning Patch Cord
When using the long wavelength/long-haul (LX/LH) GBIC with 62.5-micron diameter MMF, you must 
install a mode-conditioning patch cord (Cisco product number CAB-GELX-625 or equivalent) between 
the GBIC and the multimode fiber (MMF) cable on both the transmit and receive ends of the link. A 
mode-conditioning patch cord is required for 1000BASE-LX/LH applications over FDDI-grade, OM1, 
and OM2 fiber cable types. Mode-conditioning patch cords should not be used for applications over 
OM3 fiber cable (laser-optimized fiber cable). For additional information on mode-condtioning patch 
cords, refer to the Use of Mode Conditioning Patch Cables in Gigabit Ethernet and 10 Gigabit Ethernet 
Laser-Based Transmissions bulletin at:
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html
NoteWe do not recommend using the LX/LH GBIC and MMF without the patch cord for very short link 
distances of 33 to 328 feet (10 to 100 meters). The result could be an elevated bit error rate (BER).
The patch cord is required to comply with IEEE standards. IEEE found that link distances could not be 
met with certain types of fiber-optic cable due to a problem in the center of some fiber-optic cable cores. 
The solution is to launch light from the laser at a precise offset from the center by using the patch cord. 
At the output of the patch cord, the LX/LH GBIC complies with the IEEE 802.3z standard for 
1000BASE-LX. 
Patch Cord Configuration Example
Figure A-21 shows a typical configuration using the patch cord.
Figure A-21 Patch Cord Configuration
4 (GND)  GND
5 (GND)  GND
6 (TxD) Output
7 (DSR) Input
8 (CTS)
1Input
1. Pin 1 is connected internally to Pin 8.
Table A-30 Port Mode 2 Signaling and Pinouts (Port Mode Switch Out) (continued)
Console Port Console Device
1000BASE-LX/LH
portPatch
panel
Link span greater than 984 ft
(300 m)1000BASE-LX/LH
port
Rx
Tx
Patch
panel
Patch
cordBuilding 
cable plant
Tx
Rx
Patch
cord
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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cables
Patch Cord Installation
WarningInvisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into 
beams or view directly with optical instruments. Statement 1051
Plug the end of the patch cord labeled “To Equipment” into the GBIC. (SeeFigure A-22.) Plug the end 
labeled “To Cable Plant” into the patch panel. The patch cord is 9.8 feet (3 meters) long and has duplex 
SC male connectors at each end.
Figure A-22 Patch Cord Installation
Differential Mode Delay
When an unconditioned laser source designed for operation on an SMF cable is directly coupled to an 
MMF cable, differential mode delay (DMD) might occur. DMD can degrade the modal bandwidth of the 
fiber-optic cable. This degradation causes a decrease in the link span (the distance between the 
transmitter and the receiver) that can be reliably supported.
The Gigabit Ethernet specification (IEEE 802.3z) outlines parameters for Ethernet communications at a 
gigabit-per-second rate. The specification offers a higher-speed version of Ethernet for backbone and 
server connectivity using existing deployed MMF cable by defining the use of laser-based optical 
components to propagate data over MMF cable.
Lasers function at the baud rates and longer distances required for Gigabit Ethernet. The 802.3z Gigabit 
Ethernet Task Force has identified the DMD condition that occurs with particular combinations of lasers 
and MMF cable. The results create an additional element of jitter that can limit the reach of Gigabit 
Ethernet over MMF cable. 
With DMD, a single laser light pulse excites a few modes equally within an MMF cable. These modes, 
or light pathways, then follow two or more different paths. These paths might have different lengths and 
transmission delays as the light travels through the cable. With DMD, a distinct pulse propagating down 
the cable no longer remains a distinct pulse or, in extreme cases, might become two independent pulses. 
Strings of pulses can interfere with each other making it difficult to recover data. 
DMD does not occur in all deployed fibers; it occurs with certain combinations of worst-case fibers and 
worst-case transceivers. Gigabit Ethernet experiences this problem because of its very high baud rate and 
its long MMF cable lengths. SMF cable and copper cable are not affected by DMD. 
MMF cable has been tested for use only with LED sources. LEDs can create an overfilled launch 
condition within the fiber-optic cable. The overfilled launch condition describes the way LED 
transmitters couple light into the fiber-optic cable in a broad spread of modes. Similar to a light bulb 
radiating light into a dark room, the generated light that shines in multiple directions can overfill the 
existing cable space and excite a large number of modes. (See Figure A-23.)
To equipment To cable plant
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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cleaning the Fiber-Optic Connectors
Figure A-23 LED Transmission Compared to Laser Transmission
Lasers launch light in a more concentrated fashion. A laser transmitter couples light into only a fraction 
of the existing modes or optical pathways present in the fiber-optic cable. (See Figure A-23.) 
The solution is to condition the laser light launched from the source (transmitter) so that it spreads the 
light evenly across the diameter of the fiber-optic cable making the launch look more like an LED source 
to the cable. The objective is to scramble the modes of light to distribute the power more equally in all 
modes and prevent the light from being concentrated in just a few modes. 
An unconditioned launch, in the worst case, might concentrate all of its light in the center of the 
fiber-optic cable, exciting only two or more modes equally.
A significant variation in the amount of DMD is produced from one MMF cable to the next. No 
reasonable test can be performed to survey an installed cable plant to assess the effect of DMD, so you 
must use the mode-conditioning patch cords for all uplink modules using MMF when the link span 
exceeds 984 feet (300 meters). 
For link spans less than 984 feet (300 meters), you can omit the patch cord. (We do not recommend using 
the LX/LH GBIC and MMF without a patch cord for very short link distances of 33 to 328 feet [10 to 
100 meters]. The result could be an elevated bit error rate [BER].)
Cleaning the Fiber-Optic Connectors
Fiber-optic connectors are used to connect two fibers together. When these connectors are used in a 
communications system, proper connection becomes a critical factor.
Fiber-optic cable connectors can be damaged by improper cleaning and connection procedures. Dirty or 
damaged fiber-optic connectors can result in communication that is not repeatable or inaccurate.
Fiber-optic connectors differ from electrical or microwave connectors. In a fiber-optic system, light is 
transmitted through an extremely small fiber core. Because fiber cores are often 62.5 microns or less in 
diameter, and dust particles range from a tenth of a micron to several microns in diameter, dust and any 
contamination at the end of the fiber core can degrade the performance of the connector interface where 
the two cores meet. The connector must be precisely aligned, and the connector interface must be 
absolutely free of trapped foreign material.
LED transmission
Laser transmission
12871
LED
Laser 
						

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Appendix A      Transceivers, Module Connectors, and Cable Specifications
  Cleaning the Fiber-Optic Connectors
Connector loss, or insertion loss, is a critical performance characteristic of a fiber-optic connector. 
Return loss is also an important factor. Return loss specifies the amount of reflected light; the lower the 
reflection, the better the connection. The best physical contact connectors have return losses greater than 
–40 dB, although –20 to –30 dB is more common.
The connection quality depends on two factors: the type of connector and the proper cleaning and 
connection techniques. Dirty fiber connectors are a common source of light loss. Keep the connectors 
clean at all times, and keep the dust covers installed when the connectors are not in use. 
Before installing any type of cable or connector, use a lint-free alcohol pad from a cleaning kit to clean 
the ferrule, the protective white tube around the fiber, and the end-face surface of the fiber.
As a general rule, whenever there is a significant, unexplained loss of light, clean the connectors.
CautionUse extreme care when removing or installing connectors so that you do not damage the connector 
housing or scratch the end-face surface of the fiber. Always install protective covers on unused or 
disconnected components to prevent contamination. Always clean fiber connectors before installing 
them.
To clean the optical connectors, use a CLETOP cassette cleaner (type A for SC connectors or type B for 
MT-RJ connectors) and follow the product directions. If a CLETOP cassette cleaner is not available, 
follow these steps:
Step 1Use a lint-free tissue soaked in 99 percent pure isopropyl alcohol to gently wipe the faceplate. Wait five 
seconds for the surfaces to dry, and repeat.
Step 2Remove any residual dust from the faceplate with clean, dry, oil-free compressed air.
WarningInvisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into 
beams or view directly with optical instruments. Statement 1051
Step 3Use a magnifying glass or inspection microscope to inspect the ferrule at an angle. Do not look directly 
into the aperture. Repeat the process if any contamination is detected.
The connectors used inside the system have been cleaned by the manufacturer and connected to the 
adapters in the proper manner. The operation of the system should be error free if the customer provides 
clean connectors on the application side, follows the previous directions, and follows these guidelines:
Clean the connectors using either a CLETOP cassette cleaner (Type A for SC connectors and Type B 
for MT-RJ connectors) or lens tissues before connecting to the adapters. Use pure alcohol to remove 
contamination.
Do not clean the inside of the connector adapters.
Do not use force or quick movements when connecting the fiber-optic connectors in the adapters. 
Cover the connectors and adapters to keep the inside of the adapters or the surface of the connectors 
from getting dirty when you are not using the connectors or while you are cleaning the chassis. 
						

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  Cleaning the Fiber-Optic Connectors 
						

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APPENDIXA
Repacking the Switch
If you need to return or move the Catalyst 6500 series switch chassis, follow these steps to repack the 
switch using the original packaging material:
Step 1Set the chassis in the bottom pallet. (SeeFigure A-1.)
Step 2Place the packing bag over the chassis.
Step 3Place the front-packing material and power supply packing material around the chassis.
Step 4Place the power supplies in the spaces provided in the power supply packing material. (SeeFigure A-1.)
Step 5Place the top-packing material over the top of the chassis and power supplies.
Step 6Place the rack-mount kit and the accessory kit on the top-packing material.
NoteYou must include the accessory kit for the final packaging to fit properly.
Step 7Place the outside carton over the entire package.
Step 8Fold the outside carton down over the top and seal with packing tape.
Step 9Wrap three packing straps tightly around the top and bottom of the package to hold the outside carton 
and the bottom pallet together. (See Figure A-2.) 
						

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Appendix A      Repacking the Switch
  
Figure A-1 Packing Material
Figure A-2 Final Package
NoteDo not use tape to hold the outside carton to the bottom pallet. Packing straps must be added to hold the 
entire package together and to add strength to the package.
12984
Docs and
accessories
go in here
Top
packing
material
Power
supply(s)
go in here
12985