US Robotics COURIER User Manual page 167

COURIER HIGH SPEED MODEMS
DEDICATED AND LEASED LINE OPERATIONS
The following operations apply in installations where the
modem's phone line is not part of a public-access switched
telephone network. Instead, the modem is connected to a special
user-installed telephone line or a line that is leased from the
telephone company. These lines are often referred to as
dedicated
(to a pair of modems) or private lines.
In both types of installation there is a continuous point-to-point
connection between two modems. No dialing of phone numbers
is required. The modems may be in either Smart or Dumb mode
(determined by the position of DIP switch 8).
The User-Installed or Leased Telephone Line
User-installed lines are most commonly 2-wire lines, similar to
the 2-wire lines that connect residential phones to the public
switched network.
If you are leasing a line from the telephone company, request a
2-wire line, the type of line the modem is designed to work with.
If the telephone company only makes a 4-wire line available,
you'll need a 4-wire to 2-wire converter at each end of the
connection. If the phone company does not install the con-
verters, you will have to supply them.
For optimal operations, we recommend that the physical length
of these lines not exceed 5 miles.
Setting the Modem
If the Courier is set to &Ll, as described in what follows, and the
remote AT-compatible modem has a comparable setting, they
automatically connect when they are powered on. They also
reconnect, without any operator intervention, if a disturbance on
the line is severe enough to break the connection.
Set the modem as follows:
1. Set your terminal or communications software to the rate at
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which you want the modems to communicate. For example, -
use a terminal/software setting of 19.2K bps and, if both
modems have the capability, they will connect at 14.4K bps.
The following instructions assume that you are familiar with -
E-16 Fax and Other Operations
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