Reference Guide
IMACS System Release 5.1.9
6-19
Interface Card
Interface Card User Screens and Settings
6.3.3
Signaling Conversion Table Screen
Signaling conversion is required when cross-connecting a T1 (ANSI) voice circuit to E1
(ITU-T). This process translates the sequences of the ABCD signaling bits to allow proper
signaling between the two carrier types.
You can set up signaling conversion for all types of voice circuits from the Signaling
Conversion Table Screen, which is shown in Figure 6-9. To go to that screen, press “
b
” in the
Interface Card Main Screen (
taBs
command).
You can accept the default bit pattern changes, or you can set a different ABCD signaling bit
pattern and insert it in the table. Each voice circuit type is represented by two columns that
correspond to ITU-T to ANSI conversion (C->A) and ANSI to ITU-T (A->C) conversion.
Figure 6-9. Signaling Conversion Table Screen
For example, an E&M circuit in the “0101” state (shown in the far-left ABCD column of the
screen) will send
0101
as the ABCD bits from the ITU-T end of the circuit. The ANSI end will
receive and convert those bits to
1111
. In the opposite direction, the signaling bit sequence will
be sent as
1111
from the ANSI end and converted to
0101
at the ITU-T end. However, you can
manually override the received ABCD bit pattern at either end.
