T1 AND E1 REMOTE ACCESS CONCENTRATORS
54
4.3.6.B RBS (for T1)
The T1 models of the Remote Access Concentrator are capable of accepting incoming calls over a channelized
T1 (CT1) line provisioned for Robbed Bit Signaling (RBS). RBS is a framing pattern that allows signaling bits
to be “robbed” every sixth frame. The least significant bit of a channel’s time slot is preempted in selected
frames.
To activate RBS signaling, you must enable Channel Associated Signaling (CAS) through the Concentrator’s
Network Tools interface (see
Section 4.4
), and then configure CAS through the Module Configuration menu.
Take these steps:
1. From Local Management’s Module Menu, select Network Tools. The Network Tools command
prompt appears. (Network Tools is command-line-driven.)
2. At the Network Tools prompt, set the line’s signal mode to robbed bit by typing in the command
wanl1p signalmode robbedBit <port#>
replacing the variable <port#> with the actual port number (that is, the line number) you want
reserved for RBS. For example, to reserve both ports on the Concentrator for RBS, enter the
following two commands:
wanl1p signalmode robbedBit 1
wanl1p signalmode robbedBit 2
3. Reboot the system. (You can perform a soft reboot by typing in Network Tools’
soft_reset
command.)
