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ASYNC ROUTER AR-P, ASYNC ROUTER AR-5, SYNC ROUTER RELEASE NOTES
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Although telephone companies often offer several types of leased lines, it is important to select a type
of leased line that is supported by the Router modem. The types of lines offered differ from telephone
company to telephone company, as do the names by which they are referenced.
Here is a description of some commonly used types of lines, and whether they can be used with the
Router’s V.32 bis or V.34 modems.
1. Ringdown line
A ringdown line works well with the Router’s V.32 bis and V.34 modems.
This type of leased line is often used in applications like airport hotel hotlines: You take one of the
telephones off the hook, and the other telephone rings. In many places a local ringdown line is
offered for less than the cost of two regular business lines.
A line provisioned with ringdown works as follows:
When one end of the connection picks up the phone, the ringdown circuit automatically generates
ring voltage on the line. At the other end of the line, the phone (or modem) detects ring just like a
normal phone call. The major difference between a line provisioned with ringdown and a normal
PSTN phone line is that the ringdown line is point-to-point, and no dialing is required. Typically,
ringdown is provisioned for only one end of the connection, resulting in one end being assigned as
the originating party, and the other end being assigned the role of the answering party.
To use V.34 modems on a line provisioned with battery and ringdown, use the following dialup
command:
dialup modemX init existing_init_string X3
Adding the X3 modem command to the modem’s init string tells the modem not to look for a
dialtone when going offhook.
For the originating side of the connection, enter
dialup modemX demand -
Where (-) represents a null phone number.
For the answering side of the connection, enter
dialup modemX incoming
2. Leased line with battery voltage and no signaling
A two-wire leased line with battery (for loop current) and no signaling (no ringdown) will work with
the Router’s V.32 bis modem. It will not work with the Router’s V.34 modem.
Use the Router’s dialup commands to support each end of the connection. Assign one end of the
connection to be the originator of the dialup connection, by using the command:
dialup modemX leased_originate
Assign the other end of the connection to be the answering side of the dialup connection, by using
the command:
dialup modemX leased_answer
3. Leased line with no battery or signaling