TONE-BD (Tone-Clock Circuit)
Issue 1 May 2002
8-1665555-233-143
Clock Synchronization
NOTE:
Stratum-3 clocking is not available for a port network supported by an IPSI
TN2312 circuit pack, or a port network where the Tone-Clock function is
supplied by a TN2182.
This section discusses synchronization with a Stratum-3 or -4 clocking device.
Stratum 3
Since the clock module on the TN2312 does not support synchronization with an
external Stratum-3 clocking device, you may provide Stratum-3 clocking for a
S8700 Media Server system by using the TN780 Tone-Clock circuit pack in a
non-IPSI-connected port network. To bring in the external Stratum-3 clocking
signals into the TN780, a processor carrier is needed. This new EPN control
carrier will replace the processor carrier in the old PPN converted to an EPN 1.
The Stratum-3 clocking must come into Port Network #1 because the S8700
Multi-Connect software has the Stratum-3 clocking hard-coded to this port
network.
Stratum 4
In G3r, a PPN always resided in the system and was used as a backup
synchronization source when either a:
■ Synchronization source was not administered
■ Designated master and secondary synchronization source failed
With S8700 Multi-Connect, EPN 1 (PPN) may or may not exist and thus cannot be
relied on as the backup synchronization source. If a S8700 Multi-Connect system
does not have an administered synchronization source, it uses the first EPN that
comes up as its source. If the designated master and secondary synchronization
sources fail, the system uses any other EPN as its source. No preference is given
to EPN 1.
International Settings
NOTE:
The following information is for non-IPSI port networks.
The TN780 Tone-Clock circuit pack uses three firmware configuration parameters
for international support. The following two are automatically set by the software
load for the targeted country:
■ The circuit pack’s country-code (USA, ITALY, AUSTRALIA, etc.)
■ The circuit pack’s companding mode (mu-Law or A-Law)
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