Technical Reference

Register Default Function

S13 (Continued)

*The 1.5K-byte non-ARQ buffer allows data transfer with Xmodem- and Ymodem-type file transfer protocols without using flow control.

The 128-byte option lets remote users with slower modems keep data you are sending from scrolling off their screens. When remote users send your computer an XOFF (Ctrl-S) and you stop transmitting, the data in transit from your modem’s buffer does not exceed the size of their screen.

This is also very helpful in situations when a remote modem/printer application is losing characters.

S14

0

Reserved

 

S15

0

Bit-mapped register setup. To set the register,

 

 

see instructions for S13.

 

 

Bit

Value

Result

 

 

0

1

Disable ARQ/MNP for V.22.

 

 

1

2

Disable ARQ/MNP for V.22bis.

 

 

2

4

Disable ARQ/MNP

 

 

 

 

V.32/V.32bis/V.32terbo.

 

 

3

8

Disable MNP handshake.

 

 

4

16

Disable MNP level 4.

 

 

5

32

Disable MNP level 3.

 

 

6

64

MNP incompatibility.

 

 

7

128

Disable V.42 operation.

 

 

To disable V.42 detect phase, select the total of the

 

 

values for bits 3 and 7 (in other words S15 = 136 [the sum

 

 

of values 8 and 128])

S16

0

Reserved

 

S17

0

Reserved

 

S18

0

Test timer for &T loopback testing. Sets the time in

 

 

seconds of testing before the modem automatically times

 

 

out and terminates the test. When set to 0, the timer is

 

 

disabled. Valid range is 1-255.

67

Page 73
Image 73
3Com 1.024.1644-00 manual Technical Reference Register Default Function, S13