Specifications
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15
15.1 Description
The Contact Transfer (CTR) Module provides
eight independent, bi-directional contact closure
circuits within a single 64 kbps DS0 channel. It
can take in up to eight contacts and transfer their
status to the remote end CTR Module.
The module comprises both a main board and an
auxiliary board. It occupies two physical module
slots on the FOCUS chassis. Its eight contact
closure circuits require just one time slot on the
T1/E1 line.
15.2 Application
The CTR Module is ideal for extending the reach
of a SCADA Remote Terminal Unit (RTU) and for
remote alarm indications.
Figure 15–1. SCADA Extension Application
Using the CTR Module.
For SCADA extension, you can install a CTR
Module in a low-density substation where the use
of a full RTU is not cost effective. The contacts
would then be transferred via FOCUS to an RTU
in a more densely populated substation, as shown
in Figure 15-1. The SCADA extension configura-
tion represents a significant cost savings over the
conventional method of installing an RTU in both
substations.
For remote alarm indication, you can install the
module in a substation where you want to bring
alarm contacts back to a central location.
You should not use this module for any critical
relaying function. This is because it is designed
with no channel monitoring, and will not block
operation during channel trouble conditions. (For
critical relaying functions, the Protective Relay
Interface Module, described in Chapter 14, is the
preferred choice.)
15.3 Installation
As with other FOCUS modules, we recommend
that you initially install and test the Contact
Transfer Modules and interfaces in “test” chassis
(i.e., chassis that are not part of an operating
network). This way, you can quickly perform the
acceptance test without interfering with a live
network. Whether you are installing the modules
in test chassis or chassis that are on line in a
network, use the installation procedure described
here.
The Contact Transfer (CTR) Module, which
comprises both a main board and an auxiliary
board, occupies two chassis slots. It requires one
time slot on the T1/E1 line.
Before installing the module and its interface,
make sure that:
• The FOCUS chassis is set up, energized,
and operational, with all necessary
common equipment (see Chapter 3)
15. Contact Transfer (CTR) Module