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SERIES II INTELLIGENT DATA/FAX MODEMS
Fax Carrier V.21CH2 (Half Duplex)
Frequencies 1650Hz Mark, 1850Hz Space for Transmit
Originate
1650Hz Mark, 1850Hz Space for Transmit
Answer
V.27ter 1800Hz Originate/Answer
V.29 QAM 1700Hz Originate/Answer
V.17 TCM 1800Hz Originate/Answer
Lease Line Restoral 336+ (MD1640A) only: When in dial backup
mode, modem attempts leased line restoral
periodically (controlled by S-Register S18
setting)
Carrier Frequencies 1800 Hz V.32/V.32bis/V.34/Enhanced V.34:
33.6K/31.2K/28.8K/26.4K/24K/21.6K/
19.2K/16.8K/14.4K/12K/9.6K/7.2K/4.8K
Carrier Frequencies Transmit Originate: 1200 Hz
2400 & 1200 bps Transmit Answer: 2400 Hz
(V.22bis/V.22 or Receive Originate: 2400 Hz
Bell 212A Standard) Receive Answer: 1200 Hz
Carrier Frequencies, 1270 Hz Mark, 1070 Hz Space for
300 bps (Bell Standard) Transmit Originate
2225 Hz Mark, 2025 Hz Space for Receive
Originate
2225 Hz Mark, 2025 Hz Space for Transmit
Answer
1270 Hz Mark, 1070 Hz Space for Receive
Answer
Transmit Level -11dBm (dial-up), -9 or -15 dBm (leased-
line); dBm level selectable with DIP-
Switch #3 in leased line setting
Frequency Stability ±0.01%