Multitech CC1600 Series, Owner'S Manual

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MT2834BLR Owner’s Manual
2.6 Dial-Up and Leased Lines
Connection to the phone system is made via RJ-11 type jacks such as an RJ-11C or RJ-11W. It can
also be connected to an RJ-41 or an RJ-45S jack, but would not use these jack's dB-level
programming features. The MT2834BLR is designed to transmit at a permissive level of -10dB.
To connect the modem to the phone lines, plug one end of the RJ-11 cable that is provided with the
modem into the corresponding DB-9 connector located on the back plane of the modem rack and the
other end into the phone-company-provided RJ-11 or RJ-11W modular phone jack. Make sure that
DIP-Switch #10 is in the UP position (default) when in dial-up mode.
Although the majority of installations involves dial-up lines, the MT2834BLR also connects to two-wire
leased lines (sometimes referred to as dedicated, private, or 3002 lines).
To connect the modem to leased lines, first determine the type of line termination provided by the
phone company. Most phone companies provide a terminal block with a pair of screws. Some
provide a conventional RJ-11 type of connector. If the RJ-11 connector is used, you can use the
same cable that you use for dial-up connection. If the screw terminal type connector is used, you
may need to order the CA167 cable from Multi-Tech Systems.
Make two DIP-Switch setting changes on the modem's PC board. The first involves placing DIP-
Switch #10 in the DOWN position (changes the modem from dial-up to leased line operation). The
second DIP-Switch change requires that one of the two modems on the leased line circuit is set to
"originate", and the other is set to "answer". To do this, change the setting of DIP-Switch #5. When
you changed the DIP-Switch #10 setting, you also changed the function of DIP-Switch #5. Now the
UP position selects answer mode frequencies while the DOWN position selects originate mode
frequencies. Place DIP-Switch #5 in the UP position on one of the two modems, and on the other
modem, place Switch #5 DOWN. It doesn't matter which is which, just so you have local and remote
modems in opposite modes. (Note that the MT2834BLR defaults to 4-wire operation. If you wish to
operate 2-wire leased line, change the setting of DIP-Switch #16 to the UP position.)