Filter
Top Products
266
SX-200 ICP MX Technician’s Handbook
A&B bits
Taken from each of the 24 Channels to emulate the various analog trunk
signalling conditions (off-hook, on-hook, disconnect supervision, etc.) in
either Superframe or Extended Superframe (ESF) format.
Note: ESF is supported by the T1 module on the BCCIII card only.
Table 54: A-B Signaling States (Tie/E&M)
PBX Port
Type
CSU
Type
PBX port
condition to
channel
Transmit Receive
CSU condition to
analog facility
A B A B
Tie Trunk
(loop start)
DPO Tx loop open 0 0 x x x
loop closure 1 1 x x x
DPO Rx x x x 0 x normal battery
x x x 1 x reverse battery
DID or Tie
Trunk (loop
start)
DPT Tx normal battery 0 0 x x x
reverse battery 1 1 x x x
DPT Rx x x x 0 x loop open
x x x 1 x loop closure
TIE Trunk
4wire/2 wire
E&M
E&M Tx M-lead grounded
or open
00xxx
M-lead battery 1 1 x x x
E&M Rx x x x 0 x E-lead open
x x x 1 x E-lead grounded or
open