Nortel Circuit Card 311 Reference page 303

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Note that in D4 Framing for E1, there are no CD bits, so they are ignored.
The user is prompted for ABCD bit values for the following states when
the table mode is selected.
Send and Receive refer to the LEI sending ABCD bits to the CPE (Customer
Provided Equipment) or receiving ABCD bits from the CPE.
Incoming and Outgoing refer to E1 digital link from the CPE point of view.
Incoming is an external call arriving over the digital link and accepted by the
CPE. Outgoing is a call originated by the CPE over the digital link.
Configuring the A/B Bit Signaling table is illustrated in Set Mode (S M): Table
screen and
Figure 69
Set Mode (S M): Table screen
Copyright © 2003-2008, Nortel Networks
.
enter just the AB bits (which is copied to the CD bits)
enter a complete ABCD bit pattern
in the case of optional states, a 'N' or 'n' can be entered to indicate
that the state is not needed
Figure 70 "Set Mode (S M): Table screen" (page
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Man-Machine E1 maintenance interface software 303
304).