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Technical Reference Guide
Compaq Personal Computers
Original - December 2000
F-3
F.3 OPERATING PARAMETERS
The operating parameters consists of UART transfer rates and transmission modes.
F.3.1 UART TRANSFER RATES
The transfer rate between the modem’s UART and the PCI interface (also known as the DTE-to-
DCE transfer rate) is selectable and generally set to match the modem’s typical transmission mode.
The modem supports the standard rates of 300, 1200, 2400, 4800, 9600, 14400, 19200, 28800,
38400, 57600, and 115200 bps as well as the high-speed rate of 230400 bps.
F.3.2 TRANSMISSION MODES
The Compaq/Lucent V.90 56K PCI Modem supports the transmission modes listed in table F-1.
Table F-1. Operational Modes
Table F-1.
Operational Modes
Mode Standard Transfer Type
Transfer Rate (see text below)
K56Flex (see note) Data 56000, 54000, 52000, 50000, 48000, 46000, 44000,
42000, 40000, 38000, 36000, 34000, 32000 bps
ITU-T V.90 (see note) Data 56000, 54667, 53333, 52000, 50667, 49333, 48000,
46667, 45333, 42667, 41333, 40000, 38667, 37333,
36000, 34667, 33333, 32000, 30667, 29333, 28000
bps
ITU-T V.34Annex12 Data 33600, 31200 bps
ITU-T V.34 Data 28800, 26400, 24000, 21600, 19200, 16800, 14400,
12000, 9600, 7200, 4800 bps
ITU-T V.32bis Data 14400, 12000, 9600, 7200, 4800 bps
ITU-T V.32 Data 9600, 4800 bps
ITU-T V.17 Group 3 Fax 14400, 12000 bps
ITU-T V.29 Group 3 Fax 9600, 7200 bps
ITU-T V.27ter Group 3 Fax 4800, 2400 bps
ITU-T V.22bis Data 2400 bps
ITU-T V.23 Data 1200 / 75 bps
ITU-T V.22 Data 1200 bps
ITU-T V.21 Group 3 Fax 300 bps
BELL 212A Data 1200 baud
BELL 102 Data 300 baud
NOTE:
For 56K operation to occur with this device, the following criteria must be met:
- Distant end modem must support 56K modem technology
and
be digitally terminated.
- Transmission path must contain no more than one analog-to-digital conversion.
The criteria for 56K operation (see note under table F-1) are likely to be met when connecting to
an internet service provider (ISP) through a local phone number. Note also that the 56K transfer
rate applies only to receive data (i.e., “downloads”). Data will be transmitted (“uploaded”) at a
maximum rate of 33.6 Kb/s.