Chapter 2: Overview
The Teltone
®
Polling Controller and LSS (Line Sharing Switch or Substation
Line Sharing Switch) enable businesses and utilities having a single telephone
line or those using multiple telephone lines for data transfers to save costs
through line sharing.
Although the LSS can also be used as a standalone unit, providing a flexible,
cost-effective way to consolidate lines and route calls, Teltone strongly
recommends the use of a Polling Controller.
When working together, the two units communicate across the Public
Switched Telephone Network (PSTN) to set up and disconnect calls as well as
to determine priorities among devices and types of calls (e.g., outgoing
emergency calls from the substation take priority over polling calls).
Programming of options in the Polling Controller is done with a touchtone
telephone connected to the unit. The LSS can also be remotely programmed
through a touchtone telephone connected to the Polling Controller.
Figure 2 illustrates a typical application, in which a single telephone line is
shared by four devices: two modems, a fax machine receiving automatically
routed fax calls, and one telephone for incoming and outgoing calls.
The Polling Controller (Figure 2) is installed at the central polling location to
control how data calls are routed by the LSS.
Figure 2 Typical Application
Chapter 2: Overview
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