Page 374 7450 ESS OS Basic System Configuration Guide
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
config>system>sync-if-timing>ref2
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
st2 — SONET Stratum 2 Traceable
tnc — SONET Transit Node Clock Traceable
st3e — SONET Stratum 3E Traceable
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