Nortel Networks 553-3001-211 manual Line supervision on E1 failure, Off

NT5D33 and NT5D34 Lineside E1 Interface cards Page 255 of 894

Line supervision on E1 failure

This setting determines in what state all 30 LEI ports will appear to the

CS 1000S, CS 1000M, and Meridian 1 in case of E1 failure. Ports can appear as either in the “on-hook” or “off-hook” states on E1 failure.

Note: All idle LEI lines will go off-hook and seize a Digitone Receiver when the off-hook line processing is invoked on E1 failure. This may prevent DID trunks from receiving incoming calls until the LEI lines time-out and release the DTRs.

Daisy-Chaining to MMI

If two or more LEIs will be installed and the MMI used, daisy-chain the cards together to use one MMI terminal or modem. Make the selection for this dip switch position based on how many LEIs are being installed.

MMI Master or Slave

This setting is used only if daisy-chaining the cards to the MMI terminal or modem. It determines whether this card is a master or a slave in the daisy chain. Select the master setting if there are no LEIs between this card and the MMI terminal or modem. Select the slave setting if there are other cards in the daisy chain between this card and the MMI.

Tables 91 through 93 show the dip switch settings for Switch #1. Table 94 on page 258 shows the dip switch settings for Switch #2.

Table 91

LEI card – Switch #1 dip switch settings (Part 1 of 2)

		Switch	Switch	Factory
Characteristic	Selection	Position	Setting	Default
MMI port speed selection	1200 baud	1	ON	OFF
	2400 baud	1	OFF
E1 signaling	Ground start	2	ON	OFF
	Loop start	2	OFF

Circuit Card Description and Installation