Specifications

Copyright © AMETEK
7
7.1 Description
The FOCUS Maintenance Module, which
comprises both a main board and an auxiliary
board, provides an interface through which you
can configure and monitor your FOCUS system. It
maintains and stores configuration data for the
entire chassis, including all resident system and
channel modules. Using a high-speed watchdog
timer, it monitors the health of your system,
issuing targets/events into the event buffer to give
you information on the system’s operation.
The module has an onboard 80C188 micro-
processor, which controls three digital time/space
crosspoint switches (DX). This gives you the
capability to provide and assign T1/E1 port and
time slot assignments for the individual channel
modules. It also has non volatile memory and a
real time clock, enabling it to operate indepen-
dently from the system.
The module also provides an RS-232 craft
interface, an RJ-9 handset interface, and a
signaling button on the front panel. The RS-232
interface (see Fig. 7-3) provides a communication
link between your PC running the FOCUS
Configuration Software (FCS) and the module,
allowing you to upload and download configura-
tion settings for the individual channel modules.
The handset interface (see Fig. 7-4) provides an
RJ-9 jack for the module’s party line order wire
(PLOW) feature.
The party line order wire (PLOW) hardware/order
wire circuit lets you plug a handset into the RJ-9
jack and talk to any other point in the system. The
PLOW, sometimes called “service voice,” is espe-
cially useful because it lets everyone on the
system talk/listen simultaneously. The signaling
pushbutton will send a signal to all chassis in the
system (with PLOW enabled). This signal, when
received, will close the external alert contacts.
Historically, there have been 5 versions of
Maintenance Modules supplied. Presently, only
the MV3, MV4 & MV5 are available for new
systems.
• MV3 T1 only systems
May be converted to/from MV2 systems or
purchased as new
• MV4 E1 only systems
• MV5 Selectable for T1 or E1 systems
Installed isolated systems may be comprised of
any of these Maintenance Module versions.
||Systems are able to mix MV3 or MV4 with
MV5. However, all chassis in a system must be set
for T1 or E1 and the MV3/MV4 systems must
include the latest ROM versions for compatability
with MV5.||
The MV3 (Version 3) has the same features as the
MV2 (Version 2.x). In addition the MV3 has a
larger NOVRAM and more ROM which enables it
to support our newest features & channel
modules. The MV3 will be supplied with
firmware version 3.00 and up.
MV4 systems have been shipping to fulfill E1
requirements for many years. The newest
Maintenance Module (MV5) was introduced
several years ago for use in T1 systems. More
recently the MV5 firmware was modified to
permit operation as either T1 or E1 systems. Every
MV5 has the ability to operate in either mode
depending on the position of the MV5 jumper that
is set prior to energizing the system.
The jumper on the MV5 auxiliary board (post
08/07) must be set for T1 or E1 (see Fig. 7-10b).
The PLOW LEDs (see Fig. 7-6) provide a visual
indication of the jumper position.
• T1 – PLOW Send/Receive LEDs are off in
both non-keyed and not equipped states.
• E1 – PLOW Send/Receive LEDs are on in
both non-keyed and not equipped states.
7. Maintenance Modules
(MV2–T1, MV3–T1, MV4–E1, MV5–T1/E1)