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CHAPTER 1: Introduction and Description
Your Series II 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.
In addition, the major application for the 336+ (MD1640A) model of
the Series II Modem is in 4-wire leased line networks with the addition
of dial backup capability. With this capability, the dialup feature
prevents downtime if the leased line fails. Since the Modem 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.
1.5 Fax Features
Your Series II Modem meets the ITU V.17 standard for sending and
receiving faxes. When linked to a compatible fax machine or modem,
it can transmit faxes at 14,4 K bps. It also meets the ITU’s Group 3
Designation for sending and receiving faxes at 9600 bps; and Group 2
Designation for sending and receiving faxes at 4800 bps. The Modem is
also downward-compatible with modems to speeds as low as 300 bps, so
it can send and receive faxes with any fax machine in the world.