Installation guide

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Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 3 Installing the IGX
Making Serial Data Connections
Figure 3-13 Changing the Mode on an SDI Card
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 A jumper board ships with an impedance of either 100 ohms or 200 ohms. For higher port 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 the “Data
Cabling” section on page A-40. 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
Figure 3-14 shows an example in which 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.
Faceplate
DCE/DTE
jumper board
DCE position
SDI
123456
Faceplate
DCE/DTE
jumper board
DTE position
SDI
123456
H8370