System Management
266
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
DS1 Physical Port QL Transmission
DS1 signals can carry the quality level value of the timing source via the SSM
transported within the 1544 kb/s signal Extended Super Frame (ESF) Data Link (DL),
as specified in Recommendation G.704.
The format of the ESF data link messages is 0xxx xxx0 1111 1111, with the rightmost
bit transmitted first. The 6 bits denoted by xxx xxx contain the message; some of
these messages are reserved for synchronization messaging. It takes 32 frames (4
ms) to transmit all 16 bits of a complete DL message.
SSM over DS1 ESF is supported on the 7705 SAR-18 via the BITS ports.
E1 Physical Port QL Transmission
E1 signals can carry the quality level value of the timing source via one of the Sa bits
(Sa4 to Sa8) in a synchronization status message, as described in G.704, section
2.3.4. Choosing which Sa bit carries the SSM is user-configurable.
SSM over E1 is supported on the 7705 SAR-18 via the BITS ports. SSM via an E1
port is supported on the 16-port T1/E1 ASAP Adapter card, the 32-port T1/E1 ASAP
Adapter card, and the 7705 SAR-M, 7705 SAR-A, and 7705 SAR-X nodes.
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