Alcatel-Lucent 7950 XRS Series, Configuration Manual

Page: 387 / 502

System Management
7950 SR OS Basic System Configuration Guide Page 387
stu — SONET Synchronous Traceability Unknown
st2 — SONET Stratum 2 Traceable
tnc — SONET Transit Node Clock Traceable
st3e — SONET Stratum 3E Traceable
st3 — SONET Stratum 3 Traceable
eec1 — Ethernet Equipment Clock Option 1 Traceable (sdh)
eec2 — Ethernet Equipment Clock Option 2 Traceable (sonet)
prc — SDH Primary Reference Clock Traceable
ssu-a — SDH Primary Level Synchronization Supply Unit Traceable
ssu-b — SDH Second Level Synchronization Supply Unit Traceable
sec — SDH Synchronous Equipment Clock Traceable
ql-selection
Syntax [ no ] ql-selection
Context config>system>sync-if-timing
Description
When enabled the selection of system timing reference and BITS output timing reference takes into account
quality level. This command turns -on or turns-off SSM encoding as a means of timing reference selection.
Default
no ql-selection
ref-order
Syntax ref-order first second [ third ]
no ref-order
Context config>system>sync-if-timing
Description
The synchronous equipment timing subsystem can lock to different timing reference inputs, those specified
in the
ref1, ref2 , bits command configuration. This command organizes the priority order of the timing
references.
If a reference source is disabled, then the clock from the next reference source as defined by ref-order is
used. If all reference sources are disabled, then clocking is derived from a local oscillator.
Note that if a sync-if-timing reference is linked to a source port that is operationally down, the port is no
longer qualified as a valid reference.
Each BITS port is associated to one CCM and CPM. CPM A can only use the BITS input port on CCM A
and CPM B can only use the BITS input port on CCM B.
The no form of the command resets the reference order to the default values.