Nortel Circuit Card 311 Reference page 276

276 NT5D33 and NT5D34 Lineside E1 Interface cards
Figure 59
LEI card - E1 protocol dip switch locations
Line supervision on E1 failure
This setting determines in what state all 30 LEI ports appear to the CS
1000E, 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.
Copyright © 2003-2008, Nortel Networks
.
Note: All idle LEI lines 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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008