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TONE-BD (Tone-Clock Circuit)
Issue 1 June 2005 2337
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 PN control carrier will replace the processor carrier in the old Processor Port Network
(PPN) converted to PN 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, PN 1 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 PN that comes up as its source. If the
designated master and secondary synchronization sources fail, the system uses any other PN
as its source. No preference is given to PN 1.
Replacing the IPSI or Tone-Clock Circuit Pack
Replacing a TN2312 IPSI circuit pack or Tone-Clock circuit pack is a service-disrupting
procedure in a PN with a single Tone-Clock, because the IPSI or Tone-Clock circuit pack is
always needed to generate clocks for its PN. When the circuit pack is removed, every call is
immediately dropped, the PN enters emergency transfer within one minute, and no calls can be
set up from or to that PN.
However, if the Processor Port Network (PPN) Tone-Clock is removed for replacement in a
Standard Reliability Option system, the System Emergency Transfer feature is activated within
milliseconds, and the entire system is disrupted; no calls can be placed, and existing calls are
dropped.
However, if the Processor Port Network (PPN) Tone-Clock is removed for replacement in a
standard-reliability system, the System Emergency Transfer feature is activated within
milliseconds, and the entire system is disrupted; no calls can be placed, and existing calls are
dropped.
When replacing an IPSI or Tone-Clock circuit pack, always be sure to replace it with the
appropriate IPSI or Tone-Clock circuit pack for the system.