E.F. Johnson Company 3000 SERIES, Setup And Alignment Manual

Page: 157 / 214

19-1
WIDE AREA MODULE (WAM)
SECTION 19 WIDE AREA MODULE (WAM)
19.1 DESCRIPTION
Refer to 3000 Series Switch Service Information
manual, Part No. 001-3139-102, for the component
layout, parts list and schematic. Refer to Figure 7-1
for the Basic Board block diagram.
The WAM communicates with the other modules
via the Intra-Terminal Data Bus (IDB) and monitors
the Channel Status Bus (CSB) for the groups setup to
use the WAM.
The System and Subscriber Manager and Call
Processor configures the WAMs for the Site/Home/
Group ID combination for operation via the IDB. The
System and Subscriber Manager provides a list of up
to 30 sets of Site/Home/Group ID information. The
System and Subscriber Manager can add a single set
of Site/Home/Group ID information during operation
of the WAM. The configuration can be made perma-
nent or given a time to be active.
Once the WAM is configured, it begins call oper-
ation. The WAM monitors the CSB for activity of the
configured Groups. The WAM receives the first
active Group. The WAM acquires channels for the
other Site/Home/Group IDs and switches or wraps the
audio from the unit that is being received to the other
Groups or channels.
If a Group is active on a Site, the WAM activates
the other associated Groups on their appropriate Sites.
Once the glare condition is ensured to be cleared, the
M-Lead and E-Lead are enabled so the received audio
is passed to the external interface of the WAM and the
WAMs external M-Lead is activated.
When the received call goes idle the call goes
into optional Hang Time, depending upon the System
and Subscriber Manager configuration. When the
Hang Time expires the call is dropped, or released,
and the M-Lead is deactivated.
If both the receive and the external interface are
active, the WAM sums the two audios together for
transmission.
Figure 19-1 DATA BUS BLOCK DIAGRAM
CIMs CCMs
(NetIDB)
DATA BUS
INTRA-TERMINAL
NETWORK
(NetCSB)
STATUS BUS
CHANNEL
NETWORK
NETWORK
INTERFACE
MODULE
NetNIM
(CIB)
CHANNEL INTERFACE BUS
CONVENTIONAL
CHANNEL
MODULE
INTERFACE
CHANNEL
MODULE
INTRA-TERMINAL DATA BUS (IDB)
(CIB)
CHANNEL INTERFACE BUS
CHANNEL STATUS BUS (CSB)
DISPATCH
MODULE
CHANNEL
DCMs
PSTN OR PABX
TELEPHONE
MODULE
INTERFACE
TIMs
NETWORK
SYSTEM
MODULE
SNMs
SYSTEM NETWORK BUS (SNB)
CALL
PROCESSOR
WIDE
MODULE
AREA
WAMs
LOGGING
MODULE
ENCODER
LEMs
LOGGING RECORDER
ETHERNET
BUS