363-206-305
Administration and Provisioning
Issue 3 June 2000
8-7
Controller Maintenance and Memory
Administration
8
Controller Maintenance
8
The system controller (SYSCTL) provides control functions for the DDM-2000
FiberReach Multiplexer. The SYSCTL circuit pack provides CIT interfaces and
coordinates protection switching, as well as all shelf maintenance and
provisioning activities. The SYSCTL also provides a communications channel to
remote shelves via the DCC bytes in the OC-1/OC-3/OC-12 section overhead.
The SYSCTL has a processor with volatile random access memory (RAM), and
nonvolatile memory.
The DDM-2000 FiberReach Multiplexer is designed so that SYSCTL failures do
not affect transmission. That is, no hits or errors will occur on any traffic as a result
of a SYSCTL circuit pack failure. A SYSCTL failure does result in the loss of
automatic protection switching. However, if a transmission circuit pack fails before
a SYSCTL failure, the protection switch will remain effective during the SYSCTL
failure and service is preserved. This means that if an active transmission circuit
pack should fail while the SYSCTL is failed, a protection switch cannot be done
and service carried by the failed circuit pack will be affected.
Memory Administration
8
All transmission affecting parameters that are set by software, such as bipolar 8-
zero substitution/alternate mark inversion (B8ZS/AMI) encoding on DS1 interfaces
and cross-connect assignments, are stored in nonvolatile memory on the
SYSCTL circuit pack and on the appropriate transmission circuit packs. When the
shelf is powered up or the SYSCTL circuit pack is replaced, the shelf's
transmission values are automatically uploaded to the SYSCTL. When a
transmission circuit pack is replaced, provisioning data stored on the SYSCTL is
automatically downloaded to the replacement circuit pack. Manual action is not
required to maintain system provisioning after a circuit pack is replaced.
Certain non-service-affecting provisioned data, such as alarm delay, is stored only
on the SYSCTL circuit pack. This means that when a SYSCTL circuit pack is
replaced, the new SYSTCL circuit pack should be initialized by pressing the INIT
button during the 10-second interval while the CR alarm LED is flashing after the
SYSCTL circuit pack is inserted. This action is the same as entering the
init-sys:sysctl
command which sets the SYSCTL circuit pack parameters to
their default values. Refer to the
init-sys
command in Chapter 11, "Commands
and Reports" and to "Install or Replace SYSCTL" in the TOP section of this
manual. If parameters other than the default values are needed, the values must
be entered using the CIT. If the INIT function is not performed, whatever values
that are stored in nonvolatile memory on the new SYSCTL circuit pack are used.
Failure to follow the proper procedure may not cause transmission errors or loss of
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