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This chapter is used for M-39X-B-02 models only.

Example: When the Polling Controller and LSS are working together as a system, a
typical polling call from a host computer would progress as described below.

The host modem dials the polling call to access a modem on Port 3 of the remote LSS,
by dialing: 1-206-555-1212

The Public Switched Telephone Network (PSTN) processes the call and rings the remote
LSS.

As soon as the Polling Controller recognizes the

03 as a valid routing code, it splits the

line and puts the calling modem on hold. Then it starts sending a translation of the routing
digits (one to four unpublished DTMF digits). This translation or transfer code, is sent at
regular intervals through the network to the LSS. The transfer code will be sent at regular
intervals during the wait period until the LSS acknowledges receipt or until the calling
modem times out and terminates the call.

The LSS answers the call at the end of the first ring and waits for the programmed
amount of time for a transfer code (you program the length of time that the LSS waits for
the code, but the default is four seconds). The Polling Controller sends the code at regular
intervals to ensure that the LSS recognizes it. If, however, the LSS does not get a transfer
code during the wait period, it rings the default port, which is by default, Port 1.

When the LSS recognizes the valid transfer code for Port 3, it rings Port 3 and sends an
acknowledge tone, a typical modem answer tone, to the Polling Controller, instructing the
Polling Controller to connect the host modem to the line to complete the call.

The modem answer tone is used so that a Polling Controller can be used to dial

remote modems even when no LSS is installed.

When the Polling Controller recognizes the acknowledgment tone, it removes the line split
so that the calling modem will be listening when the receiving modem attached to Port 3
answers the data call.

At this point, the Polling Controller and LSS have established a path for the data call,
enabling the calling and answering modems to handshake properly.

The Polling Controller sends transfer codes to the LSS indicating the port to which calls
should be routed. Calls also can be manually routed to any of the ports using a one- to
four-digit transfer code. Remote programming is also accessed through transfer codes.
Each code can be a maximum of four digits in length and can contain any of the 12
DTMF digits. This option must be programmed on both the Polling Controller and the LSS
before it will be activated. Please refer to the following section.

If you are using the LSS as a standalone unit, the transfer codes can be sent manually
from a DTMF telephone or modem. (See Chapter 5, for more detail.) Individual transfer
codes can have a maximum of four digits and can contain any of the 12 DTMF digits.

Use this feature in applications where all of the devices connected to the LSS are used
for polling, including Port 1. This feature can program the LSS

not to route calls lacking

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