Cisco ASR 900 Series - SONET Line and Section Configuration Parameters

An STS-3 frame is nine rows by 270 bytes. The first nine columns contain the transport overhead section,
and the rest is SPE. For both STS-3 and STS-3c, the transport overhead (Line and Section) is the same.
For an STS-3 frame, the SPE contains three separate payloads and three separate path overhead fields. In
essence, it is the SPE of three separate STS-1s packed together, one after another.
For more information on Section Overhead, Line Overhead, and Path Overhead, refer the following:
•
http://www.cisco.com/c/en/us/support/docs/optical/synchronous-digital-hierarchy-sdh/5462-sdh-overview.html
•
http://www.cisco.com/c/en/us/support/docs/optical/synchronous-optical-network-sonet/13567-sonet-tech-tips.html
•
http://www.cisco.com/c/en/us/tech/optical/synchronous-optical-network-sonet/tsd-technology-support-troubleshooting-technotes-list.html
SONET Line and Section Configuration Parameters
The following parameters affect SONET configuration at the line and section levels:
• Overhead — Sets the SONET overhead bytes in the frame header to a specific standards requirement,
or to ensure interoperability with equipment from another vendors.
• J0 — Sets the J0 or C1 byte value in the SONET section overhead.
1 byte, 16 bytes, and 64 bytes are the supported values for J0.Note
• S1S0 — Sets the SS bits value of the H1 byte in the SONET line overhead.
• Loopback — Sets a loopback to test the SONET port.
• AIS-Shut — Configures the SONET port to send the Alarm Indication Signal (AIS) at shutdown.
• Shut — Disables an interface.
• Alarm Reporting — Enables reporting for all or selected alarms.
• lias —Enables line alarm indication signal.
• lrdi — Enables line remote defect indication signal.
• pais — Enables path alarm indication signal.
• plop — Enables loss of pointer failure signal for a path.
• pplm — Enables path payload mismatch indication.
• prdi — Enables path remote defect indication signal.
• sd-ber — Sets Signal Degrade BER threshold.
• Clock — Specifies the clock source, where:
• line —The link uses the recovered clock from the line.
• internal — The link uses the internal clock source. This is the default setting.
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x
(Cisco ASR 900 Series)
24
Configuring SONET
SONET Line and Section Configuration Parameters