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Ethernet 10/100+Modem 56
Modem S-Registers
This section provides the following information:
Introduction to S-Registers
The Xircom modem uses memory storage locations, or S-Registers, to hold information
controlling its operating environment. Few of these S-Registers require attention
from modem users. S-Registers are used in conjunction with Modem AT Commands.
To display the value of an S-Register, type ATSn? where n is the number of
the S-Register, then press Enter.
To modify the value of an S-Register, type ATSn=r where n is the S-Register
number and r is the new value or setting, then press Enter.
S-Register Reference
S0 Ring to Answer After
- The contents of register S0 sets the number of
rings required before the modem goes off-hook to answer an incoming call (auto
answer). The value can range from 0 to 255. ATS0=0 disables the auto-answer
function. The default is 0.
S1 Ring Counter
- This register is read only. The value of S1 increments
with each ring. If no rings occur over a six-second interval, the register
is cleared. The value of S1 can range from 0 to 255. The default is
0. There may be country-specific limits.
S2 AT Escape Character
S3 Command Line Termination Character
S4 Response Formatting Character
S5 Command Line Editing Character
S6 Wait Before Blind Dialing
S7 Connection Completion Time-Out
S8 Duration of Pause for Comma Dial Modifier
S10 Delay Between Lost Carrier/Hang Up
S11 DTMF Tone Duration
S12 Escape Guard Time
S28 V.34 Modulation Enable/Disable
S30 Inactivity Timer
S34 DTE Throughput Limit
- This register specifies whether the modem should limit throughput when the
DTE is operating at higher speeds (57,600 or 115,200bps)
S34=0 |
Do not limit throughput (default). |
S34=1 |
Limit throughput to DTE speed. |
S35 Data Calling Tone
S36 Negotiation Fallback
- This register specifies the action to be taken in the event of a negotiation
failure when error control is selected.
S36=0,2 |
Hang up |
S36=1,3 |
Fall back to an asynchronous
connection |
S36=4,6 |
Attempt MNP. If MNP fails,
hang up. |
S36=5,7 |
Attempt MNP. If MNP fails,
fall back to an asynchronous connection. |
S37 Dial Line Rate
S37=0 |
Maximum modem speed (default). |
S37=1 |
Reserved. |
S37=2 |
1200/75bps. |
S37=3 |
300bps. |
S37=4 |
Reserved. |
S37=5 |
Attempt to connect at 1200bps. |
S37=6 |
Attempt to connect at 2400bps. |
S37=7 |
Attempt to connect at 4800bps. |
S37=8 |
Attempt to connect at 7200bps. |
S37=9 |
Attempt to connect at 9600bps. |
S37=10 |
Attempt to connect at 12000bps. |
S37=11 |
Attempt to connect at 14400bps. |
S37=12 |
Attempt to connect at 16800bps. |
S37=13 |
Attempt to connect at 19200bps. |
S37=14 |
Attempt to connect at 21600bps. |
S37=15 |
Attempt to connect at 24000bps. |
S37=16 |
Attempt to connect at 26400bps. |
S37=17 |
Attempt to connect at 28800bps. |
S37=18 |
Attempt to connect at 31000bps. |
S37=19 |
Attempt to connect at 33600bps. |
S40 ETC Startup Autorating
S40=0 |
Start up with normal autorating (default) |
S40=1 |
Start up at initial rate of 4800 or below |
S40=2 |
Start up at initial rate of 9600 or below |
S42 Auto Rate
- V.32bis and V.22bis auto rate is disabled. Retrain operation is disabled
or enabled in date mode, and fallback is disabled in data mode.
S42=0 |
Auto rate disabled. |
S42=1 |
Auto rate enabled (default). |
S43 Auto Mode
- V.32bis startup auto mode operation disabled.
S43=0 |
Auto mode disabled. |
S43=1 |
Auto mode enabled (default). |
S46 Data Compression Selection
S46=0 |
Modem will not attempt negotiation for
data compression |
S46=2 |
Modem will negotiate with a remote modem
for data compression (default) |
S46=136 |
Same as S46=0 |
S46=138 |
Same as S46=2 |
S48 LAPM Error Control and Feature Negotiation
S48=7 |
Negotiation enabled. |
S48=128 |
Negotiation disabled; forces
immediate fallback options specified in S36. |
The following table shows the S36 and S48 configuration settings needed to
negotiate certain types of connections.
|
S48=7 |
S48=128 |
S36=0,2 |
LAPM or hangup |
<Do not use |
S36=1,3 |
LAPM or buffered |
Buffered |
S36=4,6 |
LAPM, MNP, or hangup |
MNP or hangup |
S36=5,7 |
LAPM, MNP, or buffered |
MNP or buffered |
S89 Timer to Control Sleep Mode
S91 Line Transmit Level
S92 Direct Connect Transmit Level
- This register sets the transmit level, in dBm, for direct connect cellular.
This value may have different settings for different phones. Default is 0
dBm.
S95 Negotiation Message Options
- This register enables various result codes indicating the sequence of events
in an error-controlled connection. This S-Register does not affect the way
the connection is negotiated, it just enables extended messages.
S95=0 |
Disables extended result code messages. |
S95=1 |
Use DCE (modem-to-modem) speed when reporting
CONNECT result codes. |
S95=2 |
Append "/ARQ" to CONNECT result
code when an error-controlled (EC) connection is established. |
S95=4 |
Enable CARRIER result codes. |
S95=8 |
Enable PROTOCOL result codes. |
S95=32 |
Enable COMPRESSION result codes. |
S98 Cable Detection Options
- This register controls the automatic detection and reporting of changes
in the cable or alternative connector attached to the modem.
S98=0 |
Disables cable detection and reporting. |
S98=1 |
Enable cable detection; disable reporting. |
S98=2 |
Enable cable detection and reporting. |
S109 V.90 or K56flex Operation
- This register controls the automatic detection or forced setting of V.90
or K56flex standards for operation at up to 56Kbps.
Xircom firmware for current 56K modem products includes support for the
V.90 56K modem standard. This firmware is designed to initially attempt
to make a V.90 connection, then fall back to K56flex if the host being dialed
does not support V.90. However, the host being dialed must support V.90
autodetect in order for a V.90 connection to be initiated by default. If
the V.90 host you are calling does not support autodetect, it will be necessary
to issue an ATS109=2 command to the modem in order to force a V.90 connection.
If this command is used and a V.90 connection is still not achieved, the
modem will fall back directly to V.34 (when S109=2, fallback from V.90 to
K56flex is disabled). To set this value back to the default, issue ATS109=1.
S109=0 |
Forces K56flex; fallback to V.34. |
S109=1 |
Negotiates V.90 initially if host supports
V.90 autodetect; negotiates fallback to K56flex if V.90 autodetect or
V.90 is not supported. |
S109=2 |
Forces V.90 for PCM connects; if host does
not support V.90, falls back directly to V.34. |
How to Set S109
- To change the value of the S109 register with a terminal emulation program
(such as HyperTerminal), enter ATS109=n (where n is 0, 1, or 2) in modem command
mode.
- To change the value of the S109 register with Windows 95, 98, or NT Dial-Up
Networking, go to Control Panel, Modems, highlight the Xircom modem and click
Properties. Click Connections/Advanced. Enter S109=n (where n is 0, 1, or
2) in the Extra Settings box.
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