Multi-Tech Systems BL-Series - Manual (Page 10)

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MultiModemBL User Guide
1.3 Modem Features
The MultiModem BL Series modem connections can be made on Public Switched Telephone
Networks (PSTNs) and/or point-to-point 2-wire and 4-wire leased telephone type circuits.
Your modem offers interactive automatic dialing, as well as Command Mode option configuration.
You may store up to ten command line/telephone numbers, of up to 60 characters each, in the
modem’s nonvolatile memory. The modem pulse or tone dials, and recognizes dial tones and busy
signals for reliable call-progress detection. The modem can detect AT&T calling card tones. It is
FCC-Registered for connection to telephone networks without any Data Access Arrangements
(DAA’s).
Your modem also features Callback Security to protect networks from unauthorized use, and to
manage phone line costs. By using the modem’s phone number and password directory, a host site
can, upon receipt of a call, callback to a remote site at a predetermined number.
Remote Configuration permits you to assist users at remote sites, saving you the time and trouble of
site visits and preventing misinterpretation of configuration instructions.
1.3.1 2834 Series Features
Your MT2834BL modem meets the proposed Enhanced V.34 ITU standard for data signalling rates
as high as 33.6/31.2K bps in full duplex mode. Enhanced V.34 is an extension of V.32/V.32bis/V34
standards, and supports and is compatible with those features, including EIA extended Automode;
adaptive line probing; automatic symbol rate and carrier frequency during start-up; and retrain and
rate renegotiation (in 2400 bps increments).
The major application for the MT2834BL is in 4-wire leased line networks with the addition of dial
backup capability. With this capability, the dial-up feature saves any down time if the leased line fails.
Since the MT2834BL operates according to ITU V.34 modulation, it can operate full-duplex over two
wires, so that the dial backup mode performs the same throughput as the leased line.
The MT2834BL features ITU V.42 error correction and V.42bis data compression, providing 100%
error-free data transmission. V.42 error correction incorporates MNP( Classes 3 and 4, and LAP-M.
You may select V.42bis data compression for 4-1 throughput, or MNP Class 5 for 2-1 throughput.)
1.3.2 1932 Series Features
Your MT1932BL modem is designed according to the American Telephone and Telegraph (AT & T)
V.32terbo de facto standard for data signalling rates as high as 19.2/16.8K bps full-duplex mode.
V.32 terbo supports and is compatible with all V.32 and V.32bis features including EIA extended
Automode, the V.32 start-up sequence, and V.32bis retrain and rate renegotiation.
The major application for the MT1932BL is in 4-wire leased line networks with the addition of dial
back-up capability. With this capability, the dial-up feature saves any down time if the leased line
fails.
The MT1932BL is AT command set compatible and incorporates a number of capabilities beyond the
basics of V.32terbo operation. Other capabilities include CCITT V.25bis standard for synchronous
dialing, compatibility with CCITT V.42 error correction and V.42bis data compression in which data
communication speeds can approach 78,600 bps (depending on the file content and the receiving
modem’s capability) and the data sent will be 100% error free. V.42 error correction incorporates both
MNP Classes 3, 4 and LAPM. Data compression can be V.42bis for 4 to 1 throughput improvement
or MNP Class 5 for 2 to 1 throughput.