DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1550SW-CTL (Switch Control)
9
SW-CTL (Switch Control)
The Switch Control resides on the MSSNET (Mass Storage System and Network
Control) circuit pack (UN332). The Mass Storage System Host Adapter (HA) also
resides on the MSSNET circuit pack. Systems equipped with the Standard
Reliability configuration have a single MSSNET circuit pack and systems
equipped with the High Reliability or Critical Reliability configuration have two
MSSNET circuit packs, one in each Switch Processing Element (SPE) complex.
The MSSNET cannot be replaced in a system with one SPE complex without
bringing the system down. The MSSNET in the standby SPE of a system
equipped with the High Reliability or Critical Reliability option can be replaced
without affecting normal system operation.
The Switch Control sends control information between the SPE and port circuit
packs on the Processor Port Network (PPN) as shown in Figure 9-91
. This control
information is sent via the PPN cabinet’s TDM (Time Division Multiplexed) bus.
The portion of the TDM bus used to transmit control messages is called the
control channel. The control channel can be on either TDM bus A or TDM bus B,
but only one of the two buses is used for the control channel at any give time.
The Switch Control is involved in sending control channel messages for the setup
and takedown of all calls involving endpoints connected to the PPN, but is not
involved in the voice or data transmission that takes place during established
calls. The Switch Control is also involved in setting up system links used for
control of calls involving endpoints connected to Expansion Port Networks
(EPNs). Once those links are set up at system boot time, a failure of the Switch
Control will not affect existing calls or new calls involving those EPN endpoints.
One of the functions of the Switch Control is to detect when port circuit packs are
plugged into or removed from the PPN cabinet. The Switch Control also monitors
the health of the control channel on the PPN cabinet TDM bus and informs the
SPE when errors occur.
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
1
1. In a system with simplex SPE, the carrier location, a need not be specified. In a system with
duplicated SPEs, carrier a or b must be specified.
Full Name of MO
SW-CTL MAJOR
2
2. After a spontaneous SPE interchange has occurred, the Alarm Log retains for three hours a
record of any MAJOR ON-BOARD alarm against an SPE component that took place before
the interchange. If a spontaneous interchange has occurred (as indicated by STBY-SPE
error type 103 or the display initcauses screen), and such an alarm is logged against
SW-CTL, then replace the standby MSSNET circuit pack using the "lock-and-power-down"
procedure described in
Chapter 5.
test switch-control [a|b] short Switch Control
SW-CTL WARNING test switch-control [a|b] short Switch Control
