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78-11719-02 July 2001 Using Cisco Transport Controller 3
Cisco ONS 15327 User Documentation 3-39
• Coding—Set to the coding used by your BITS reference, either B8ZS or AMI.
• Framing—Set to the framing used by your BITS reference, either ESF (Extended
Super Frame, or SF (D4)(Super Frame). SSM is not available with Super Frame.
• Sync Messaging—Check to enable SSM.
• AIS Threshold—Sets the quality level where a node sends an alarm indication signal
(AIS) from the BITS 1 Out and BITS 2 Out MIC pins. When a node times at or below
the AIS Threshold quality, an AIS is sent (used when SSM is disabled or frame is SF).
Reference fields define up to three timing references for the node and up to six BITS Out
references. BITS Out references define the timing references used by equipment that can
be attached to the node’s BITS Out pins on the MIC. If you attach equipment to BITS
Out, you must attach it to a node in Line mode because equipment near the External
timing reference might be directly wired to the reference.
• NE Reference—Defines up to three network element (the current node) references,Ref
1, Ref 2, Ref 3. The options displayed depend on the node’s timing mode. If the timing
mode is External, the options are BITS1, BITS2, and Internal. If the timing mode is
Line, the node’s working optical cards are displayed. In this case, select optical ports
on cards that are directly or indirectly connected to a BITS timed source, that is, the
node’s trunk cards.
• BITS 1 Out/BITS 2 Out—Define the timing references for equipment wired to the
BITS Out pins. Normally, BITS Out is used with Line nodes, so the options displayed
are the working optical cards.
Note Changing the BITS facilities settings affects both BITS In and BITS Out.