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 &L1, 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.
Dedicated and Leased Line Operations F-15
