User's Manual

SERIES II INTELLIGENT DATA/FAX MODEMS

1.3 What is in Your Modem Package?

Your Series II Modem is made up of many components. Make sure you

have them all before trying to operate your modem. Your package

should include:

• The Series II Modem itself

• AC Power Transformer

• (2) RJ-11 to RJ-11 telephone cords

• This Owner’s Manual

• 336+ (MD1640A) only: (1) RJ-11 to spade lugs leased-line cable

If any of these items are missing, please contact Black Box.

1.4 Modem Features

Your Series II 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.

Connections can be made on Public Switched Telephone Networks

(PSTNs) and/or point-to-point 2-wire and 4-wire leased telephone type

circuits. 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).

Your modem is compatible with the AT command set and the ITU

V.25 bis standard for sunchronous dialing. It also 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.)