Chapter 2: Overview
The Teltone
®
SLSS has been designed to consolidate telephone lines at electrical
utility substations. It enables utilities having only one telephone line or those
using multiple telephone lines for data transfers to save costs through line
sharing. The SLSS also increases line efficiency by allowing devices, such as
telephones, modems connected to fault locating relays, meters, etc., and fax
machines to share a phone line in a substation. It can work with a Teltone Polling
Controller as a system (U.S. Patent No. 5,241,587) or it can operate as a standalone
unit to give you a flexible, cost-effective way to eliminate extra substation
telephone lines and route calls.
Figure 1 illustrates a typical application, in which a single telephone line is shared
by four devices. The Polling Controller is added to your existing hardware at the
data retrieval location.
The SLSS offers many benefits, some of which include its ability to:
•
Share a single substation telephone line between up to eight devices.
•
Eliminate expensive telephone line installation and monthly charges for
briefly used modem lines.
•
Ensure correct call routing by using a Polling Controller.
•
Enhance worker safety by giving priority to telephone users.
•
Hide substation modems from unauthorized access.
•
Obtain high reliability and availability with a unit providing C37.90 SWC
protection to attached devices and powered from 42-150 VDC batteries
(“A” and “B” models only) or 90-150VAC (“D” model only) or 90-220VAC
(“E” model only).
Figure 1 Typical SLSS Application
Reference Manual
Chapter 2: Overview
40-400-00031, Rev. A
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