Installation manual

LBI-38987B OPERATION
10
OPERATION
STAND-ALONE SCAT
The stand-alone SCAT consists of a standard EDACS
Station as shown in Figure 1, with the GETC personality
configured for SCAT operation (special SCAT software
344A3835G2 required prior to release 5). In this
configuration, the repeater transmits Control Channel
information until a radio requests a channel. The SCAT
repeater then assigns itself as the Working Channel and
begins routing audio. When the call is complete, the SCAT
channel resumes operating as the Control Channel.
NETWORK SCAT
The second configuration is a Network SCAT channel
used as part of an EDACS Multisite system. In this
configuration, the SCAT station is connected to the
C
onsole
E
lectronics
C
ontroller or
I
ntegrated
M
ultisite and
C
onsole
Controller (
CEC/IMC
) as shown in Figure 2. Each SCAT
channel has its own Downlink and audio/data interface into
the CEC/IMC.
The Network SCAT channel configuration requires a
standard EDACS station with the SCAT option (XXCP3Y).
This option adds a SCAT Downlink GETC and a SCAT
interconnect cable to link the SCAT Station GETC to the
Downlink GETC. Prior to release 5, the option also
included SCAT software (344A3835G2) which was
installed in both the SCAT Station GETC and the SCAT
Downlink GETC. With release 5, the system uses a
standard Station GETC (with “speedy” processor upgrade)
and standard Link GETC with personalities setup for SCAT
operation.
The CEC/IMC controls and routes SCAT calls,
allowing the user to enjoy trunking features and the same
trunked user interface. The CEC/IMC must be configured
with a site interface (MSZM3R) for the SCAT system.
As a result of the SCAT station using only one channel,
only one conversation can occur at any one time through the
SCAT site. While the SCAT site is busy, every call request
(mobile request or console request) is queued. The mobile
radio generates the Call Hold Off queue tone and
automatically places a call request upon completion of the
first call. Only console request for the active group will be
processed immediately.
The SCAT channel and SCAT radios are designed to
minimize the overloading of the inbound SCAT channel by
prioritizing all calls. This allows the system to respond to
emergency calls immediately upon availability of the
channel.
SCAT
GETC
MASTR II/IIe/III
Repeater
Figure 1 - Stand-alone SCAT
SCAT
GETC
MASTR II/IIe/III
Repeater
SCAT Downlink
GETC
Uplink GETC
CEC or IMC
Audio
Data Link
4 wire
AUDIO
CONTROL
4 wire 9600 baud
Figure 2 - Network SCAT Station