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Making Serial Data Connections
Figure 3-12
Faceplate
Faceplate
HDM and LDM Redundancy
Optional redundancy for HDM and LDM cards can be provided with a second front and back card
set and a Y-cable connection on each port to the customer data equipment.
Note
speeds, the impedance is important if you have specified Y-cable redundancy. With Y-cable
redundancy on a higher-speed connection, use the 200-ohm jumper board. With no Y-cable
redundancy or when the port speed is relatively low, the 100-ohm jumper board is adequate.
Configuring the Mode of an LDI Port
Each port on an LDI card uses an adapter cable. For a list of LDI adapter cables, refer to Appendix C,
"Cabling Summary." Each cable does the following:
•
Determines whether the port operates in DCE mode or DTE mode
•
Connects the port's 15-pin connector to a 25-pin D connector
•
Converts to either a male or female pinout
See Figure 3-13 for an example. In Figure 3-13, the adapter cable makes the port a DCE port.
Circuits on the card test certain pins on the cable then configure the port as DTE or DCE.
3-26 Cisco IGX 8400 Series Installation and Configuration
Changing the Mode on an SDI Card
DCE position
1 2 3 4 5 6
DTE position
1 2 3 4 5 6
A jumper board comes with an impedance of either 100 ohms or 200 ohms. For higher port
DCE/DTE
jumper board
SDI
DCE/DTE
jumper board
SDI
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