System Command Reference
402 Basic System Configuration Guide
Description This command configures the values used to identity the source of the BITS (Building Integrated
Timing Supply) output. This is either the signal recovered directly from ref1, ref2 or ptp, or it is the
output of the node’s central clock. The directly recovered signal would be used when the BITS output
signal is feeding into an external stand alone timing distribution device (BITS/SASE). The specific
directly recovered signal used is the best of the available signals based of the QL and/or the ref-order.
The central clock output would be used when no BITS/SASE device is present and the BITS output
signal is used to monitor the quality of the recovered clock within the system.
Default line-ref
Parameters line-ref — Specifies that the BITS output timing is selected from one of the input references,
without any filtering.
internal-clock — Specifies that the BITS output timing is driven from the system timing.
ssm-bit
Syntax ssm-bit sa-bit
Context config>system>sync-if-timing>bits
config>system>sync-if-timing>ref1 (7750 SR-c12 only)
config>system>sync-if-timing>ref2 (7750 SR-c12 only)
Description This command configures which sa-bit to use for conveying SSM information when the interface-type
is E1.
Default 8
Parameters sa-bit — Specifies the sa-bit value.
Values 4–8
ql-override
Syntax ql-override {prs | stu | st2 | tnc | st3e | st3 | eec1 | sec | prc | ssu-a | ssu-b | eec2}
no ql-override
Context config>system>sync-if-timing>bits
config>system>sync-if-timing>ptp
config>system>sync-if-timing>ref1
config>system>sync-if-timing>ref2
Description This command configures the QL value to be used for the reference for SETS input selection and BITS
output. This value overrides any value received by that reference's SSM process.
Default no ql-overide
Parameters prs — SONET Primary Reference Source Traceable
stu — SONET Synchronous Traceability Unknown
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