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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1310SW-CTL (Switch Control)
10
SW-CTL (Switch Control)
The Switch Control resides on the TN777 Network Control (Netcon) circuit pack.
The data channels (DATA-BD and DATA-CHL) also reside on the Netcon circuit
pack. Standard systems have a single Netcon circuit pack and High and Critical
Reliability systems have a Netcon circuit pack in each SPE complex. The Netcon
in a standard system cannot be replaced without bringing the system down. The
Netcon in the standby SPE of a High or Critical Reliability system can be
changed without affecting normal system operation.
The Switch Control is used to send control information between port circuit packs
and the processor (see Figure 10-86
). 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, and the processor can switch in a spare Tone-Clock circuit pack, if
one is available (High or Critical Reliability system).
MO Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
SW-CTL MINOR test network-control a/b sh Switch Control
SW-CTL MAJOR test network-control a/b sh Switch Control