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TECHINFO-0021117
TOPIC
I have a copy of the AT Command Reference, which I downloaded from one of Apple's Software Update locations. I need to slow my GeoPort modem to 14.4 kbps. I am confused by the presentation for the S110 register on page 17, which states the following:
S110 Modulation Selector
| 0 | V32/V32bis enabled, V34/34 (33.6) disabled |
| 1 | V32/V32bis enabled, V34/34 (33.6) disabled |
| 2 | Full modulation set available |
| 7 | V34 (33.6) only enabled |
The descriptions for the first two settings seem identical. Should they be?
DISCUSSION
There is an error in the documentation. The first two items should read:
0 V32 enabled, V32bis disabled, V34/34 (33.6) disabled 1 V32/V32bis enabled, V34/34 (33.6) disabled
To elaborate:
V32 = 9600 baud protocols
V32bis = 14.4 kbps protocols
V.34 = 28.8 kbps protocols. Recently, this standard was upgraded to include 33.6 kbps protocols; Apple Telecom software version 3.1 or newer will support these protocols on Power Macintosh computers.
As an example, passing the command ATS110=0 to the modem will turn on 9600 bps only.
Passing the command AT110=1 will allow the modem to adjust speed to 9600 or 14.4 kbps as necessary, and will turn off 28.8 or 33.6 kbps performance.
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