VLL Services
7705 SAR OS Services Guide Page 143
T1 CAS is supported when ESF or SF framing is configured. ESF framing uses a 24-frame
multiframe and transfers all four signaling bits (ABCD). SF framing uses a 12-frame
multiframe and transfers only the AB bits. The signaling bits are carried in the least
significant bit of the following frames:
• A bit in frame 6
• B bit in frame 12
• C bit in frame 18
• D bit in frame 24
Table 17 shows the structure of a T1 ESF multiframe that uses RBS. The structure of a T1
SF multiframe is based on 12 frames and only the A and B bits are available.
Note: On the 7705 SAR, CAS/RBS is enabled at the port level, rather than at the 64 kb/s
channel level. This means that control signals and voice and data signals are all carried in
the same channels. However, T1 and E1 links with a mix of voice and data channels cannot
be transported directly across a 7705 SAR/SR network. For a workaround, please contact
your Alcatel-Lucent technical service representative.
This limitation does not apply to Serial Data Interface card and E&M card traffic transported
over MPLS as the signaling is transported in individual pseudowires.
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