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Maintenance Objects
1588
Issue 5 October 2002
SW-CTL (Switch Control)
The Switch Control resides on the TN2402/TN798 Processor circuit pack. The
data channels (DATA-BD and DATA-CHL) also reside on the Processor circuit
pack. The Switch Control is used to send control information between port circuit
packs and the processor. This control information is sent via the PPN cabinet’s
Time Division Multiplex (TDM) 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 bus is used for the control channel
at any given time.
The Switch Control is critical in the setup and take down of all calls but is not
involved in the voice or data transmission that takes place during established
calls. It is the Switch Control that detects when port circuit packs are plugged into
or removed from the PPN cabinet. This information is then sent to the processor.
The Switch Control monitors the health of the control channel on the PPN cabinet
TDM Bus and informs the processor when errors occur.
The Switch Control contains the hardware Time of Day (TIME-DAY) clock that the
system uses for all its date and time information. In addition, the Switch Control
also contains hardware to monitor critical system timing signals and informs the
processor when these signals fail. For example, if the timing signals from a
Tone-Clock circuit pack in the PPN cabinet fail, the Switch Control informs the
processor.
Error Log Entries and Test to Clear Values
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
SW-CTL MINOR test network-control a sh Switch Control
SW-CTL MAJOR test network-control a sh Switch Control
Table 455. SW-CTL Error Log Entries
Error
Type
Aux
Data Associated Test
Alarm
Level
On/Off
Board Test to Clear Value
0
1
0 Any Any Any test network-control a sh r 1
1 Any Control Channel
Test (#94) MAJOR ON test network-control a r 3
2 (a) Control Channel
Test (#94) MAJOR ON test network control a r 3
257 (b) 0 or 1 None
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