Teltone m-392 Guida Utente

This chapter is used for M-39X-B-01 models only.

The LSS can be used with or without the Polling Controller. In this Standalone mode, the
modem or fax dialing string must be programmed to direct calls to assigned ports. (For
example, in Figure 6, modem calls to the POS server would be sent to Port 3 and fax
calls to Port 2.) The LSS can have two, three, or four ports.

A typical polling call from the host computer to a Standalone LSS would

progress as described below.

The host modem dials the polling call to access a modem on Port 3 of the remote LSS.
The host modem dials: 206-487-1515 ,,,, 33

The “,,,,” are pauses which must be included in the dial string to ensure that the

LSS has time to answer before the transfer code, 33, is sent. (The number of pauses
depends on the amount of time that the PSTN takes to ring the LSS and for the LSS to
answer the call after the first ring.) The 33 assumes that you have programmed the LSS
so that 33 is the code to transfer the call to Port 3. (The default transfer code for
Standalone operation.)

The LSS answers the call at the end of the first ring, then waits a programmable amount
of time (four to 30 seconds, the default is 4 seconds) for a transfer code. If the LSS does
not recognize a transfer code during the wait period, it rings the default port, usually Port
1.

When the LSS recognizes the valid transfer code for Port 3, it sends an acknowledgment
tone (a modem answer tone) to the calling modem and rings Port 3.

The modem answer tone is used in case a Polling Controller occasionally calls

the LSS. (The tone removes the line split at the Polling Controller.) You can program the
LSS so that no acknowledgment tone is sent, a modem answer tone is sent, (default), or
a DTMF command, #B, is sent. If a Polling Controller will never be used to access the
LSS, use the first option (i.e., no acknowledgment tone sent) using programming
Command 72.

At this point, the LSS has established a metallic path between the incoming telephone
line and Port 3 for the data call; the calling and answering modems can now handshake
properly.

Example: An alternative method of making a data call to a Standalone LSS is described
below.

The host modem dials the polling call to access a modem on Port 3 of the remote LSS,
by dialing: 206-487-1515W,33

The LSS can be programmed to answer incoming calls with either silence, which

is the default, a three-beep confirmation tone, or four seconds of dial tone.

The dial tone allows the host dial string to include a W indicating a wait for dial tone
before proceeding. This avoids guesswork about the number of “,” pauses to put in the
dial string. Unfortunately, people calling the LSS will also hear the dial tone and must be
instructed to simply wait for the call to ring through to the attached telephone on Port 1.

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