Technical Manual

EX7100 Technical Manual - Module Descriptions
©1999 Exicom Technologies (1996) Ltd 7-56 Issue 4 - August 2001
7.11 Modem/Controller Module Type 2966
7.11.1 General
The Modem/Controller module provides the bulk of the EX7100 terminal’s control and
data conversion functionality. Although the same hardware is used for both UHF and VHF
systems, different software is fitted.
This module contains the master controller for the EX7100. This controls the Front Panel
module and manages the microcontrollers that are present on many of the other modules
via an RS-485 bus. Each module within the EX7100 contains a microcontroller that
manages and stores the parameters particular to that module. The main controller acts
as an interface between each module and the user, giving access to each module’s
parameters, and monitoring for alarms. Diagnostic and alignment tools are also available
through the controller.
Also present on this module is the EX7100 modem and framer. Incoming user data to the
terminal has system engineering data added, then is converted to a format suitable for
transmission over the link, and output to the transmitter module. Similarly, data from the
receiver is converted from the transmission format, has the system engineering data
removed, and sends the user data to the requiired interface. The rear panel data
connector PCB connects the Modem/Controller PCB to the external world.
The Modem/Controller module also contains the 64kbps digital interfaces, G.703 and
V.35. The user connections to these interfaces on the rear panel connect directly to this
PCB.
Modem/Controller
Module
Rear Panel
Data
Connector
PCB
64k Data &
Clocks
I/O Port
Ribbon
Connector From
Modem Controller
Control
LMS
64kbps Data
Control
LMS
I/O
Front Panel
Module
RX&TX
64k Data
Module
Comms
Bus
Rear Panel
Connectors
Ribbon
Connector From
Modem Controller
Figure 7.27: Modem/Controller Block Diagram