Toshiba Strata DK 280 Installation Manual page 643

Flowchart 11-3
Synchronization Slip Problems
Start
P
Slip problems cause
periodic clicking on the
talk path. Clicks can occur
many times (severe case)
during a call or only a few
times during a 24-hour
period.
Slips occur when
synchronization timing is
lost for an instant and then
recovers.
Monitor slips using
'71 ERR" function in
DK280 remote
maintenance DUMP
mode.
One example of a slip fault
when using more than one
RDTU Tl span is provided
in Figure 11-12.
than one RDTU
No
.
.
l
If RDTU spans are connected to a Telco
or long distance provider, program the
first RDTU as the primary reference and
the second as a secondary reference
using Program *42 (see Figure 11-12).
l
If a third RDTU is connected to a PBX,
the PBX should be set up as a slave to
the RDTU.
l
If all RDTUs are connected to a PBX,
then either the RDTUs can be set as
primary and secondary references
(slaves) and the PBX as the master
(Program *42 data is blank; or, all
RDTUs should be set as the master and
the PBX Tl s should be slaves.
Program as required.
I
If RDTU is connected to a reliable
clock source (Telco, AT&T etc.)
then it should be programmed as a
slave (primary reference) to the
provider. (Program *42 - data = 1).
If RDTU is connected to a PBX or
channel bank, make sure that
RDTU is programmed as the
master clock provider (Program
*42 - data = blank); or, if the PBX
is set up as a master, the RDTU
should be programmed as a
primary reference.
Program as required.
Use Program *42 and assign a different RDTU as Primary reference.
+
If problem continues try another RDTU as Primary reference.
l
Check all cable connections and
correct as necessary.
DK0525
l
Change Primary reference RDTU.
l
If problem continues after RDTU is
and RCTU are changed, contact the Tl
provider and request a point-to-point
Contact your No
technical support
January
1996
11-19