Cisco Systems IGX 8400 Series manual HDM and LDM Redundancy, Configuring the Mode of an LDI Port

Making Serial Data Connections

Figure 3-12 Changing the Mode on an SDI Card

Faceplate

	DCE/DTE
DCE position	jumper board

SDI

1 2 3 4 5 6

Faceplate

						DCE/DTE
	DTE position					jumper board
						SDI
1	2	3	4	5	6

H8370

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 comes 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 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 3-13for 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.

3-26Cisco IGX 8400 Series Installation and Configuration