US Robotics 56K USB Modem User Manual page 108

S35—Data Calling Tone
Data calling tone is a tone of a certain frequency and cadence as specified in V.25, which allows remote
data/FAX/voice discrimination. The frequency is 1300 Hz with a cadence of 0.5 s on and 2.0 s off. The
setting of the homologation parameter 1f, calling tone flag, determines if S35 (same as -C command) is
enabled. If the calling tone flag is set to 1, this register is valid. Otherwise, this register has no effect.
Note: This register's default value may vary based on country selection.
Range: 0—1.
• Default: 0.
S36—Negotiation Fallback
S36 specifies the action to take in the event of negotiation failure when error control is selected.
S36 is used in conjunction with S48, LAPM error control and feature negotiation, to negotiate certain
connection types. Refer to Table 224 on page 104 for the settings of each connection type.
Range: 0—7.
• Default: 7.
Table 217. Register S36 Values
Values
0, 2 Hang up.
1, 3 Fall back to an asynchronous connection.
4, 6 Attempt MNP. If MNP fails, hang up.
5, 7 Attempt MNP. If MNP fails, fall back to asynchronous connection.
S37—Dial Line Rate
This register sets the maximum line data rate. In V.90 mode, S37 controls the upstream V.34 rate.
Range: 0—19.
• Default: 0.
Table 218. Register S37 Values
Value Rate
0 Auto rate (default).
1 Reserved.
2 1200/75 bits/s (V.23).
3 300 bits/s.
4 Reserved.
5 1200 bits/s.
6 2400 bits/s.
7 4800 bits/s.
8 7200 bits/s.
9 9600 bits/s.
Description
Value Rate
10 12000 bits/s.
11 14400 bits/s.
12 16800 bits/s.
13 19200 bits/s.
14 21600 bits/s.
15 24000 bits/s.
16 26400 bits/s.
17 28800 bits/s.
18 31200 bits/s.
19 33600 bits/s.
56K USB Modem
User Guide
Command Reference - 102