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Chapter 4 - Advanced Data Communications
4-4
Universal Protocol Compatibility
Universal compatibility covers a broad range of ITU-T and BELL standards, and
provides data compression.
Various operation modes that can be achieved are as follows:
Standard BPS rate
(+/-0,01%)
Baud rate
(+/-0,01%)
Modulation Carrier Freq
[Hz]
V.34 28 800 - 2 400 multiple multiple multiple
ZyXEL 19 200 2 743
ZyXEL 16 800 2 400
V.33* 14 400 2 400 128-TCM 1800
V.33* 12 000 2 400 64-TCM 1800
V.32bis 14 400 2 400 128-TCM 1800
V.32bis 12 000 2 400 64-TCM 1800
V.32bis 7 200 2 400 16-TCM 1800
V.32 9 600 2 400 32-TCM 1800
V.32 uncoded 9 600 2 400 16-QAM 1800
V.32 4 800 2 400 4-DPSK 1800
V.29* 9 600 2 400 16-QAM 1700
V.29* 7 200 2 400 8-QAM 1700
V.29* 4 800 2 400 4-DPSK 1700
V.27bis* 4 800 1 600 8-PSK 1800
V.27bis* 2 400 1 200 4-DPSK 1800
V.26bis* 2 400 1 200 4-DPSK 1800
V.23 1200 / 75 1200 / 75 FSK
V.23 600 / 75 600 / 75 FSK
V.22bis† 2 400 600 16-QAM 1200 Orig.
2400 Ans.
V.22† 1 200 600 4-DPSK 1200 Orig.
2400 Ans.
V.21 300 300 FSK
BELL 103 300 300 FSK
G3 FAX Implemented according to T.30, V.17,V.29 and V.27ter.
Cellular Modes ZyXEL proprietary cellular modes; 14400 bps to 4800 bps.
Choosing the Modem Link Options
The Link options or protocol negotiation settings are controlled by the
&N
command. The default setting is
&N0
. The modem will execute an auto-handshake
sequence to determine the protocol being used by the remote modem, and connect
at the highest allowable speed.
The link options can also be set to force negotiation to any one of the protocol
options listed in the above table using
&N1
to
&N73
. If the modem cannot
successfully negotiate the protocol that was set, connection will be refused, and
the modem will release the line. For specific settings, please refer to Chapter 11.