Bay Networks 5399 Configuration Notes

August 1997

Model 5399 RAC

Digital Modem

Configuration

Notes

Copyright

©

1997 Bay Networks, Inc.

The information in this document is subject to change without notice. The statements, configurations, technical data, and

recommendations in this document are believed to be accurate and reliable, but are presented without express or implied

warranty. Users must take full responsibility for their applications of any products specified in this document. The

information in this document is proprietary to Bay Networks, Inc.

The software described in this document is furnished under a license agreement and may only be used in accordance with

the terms of that license.

Restricted Rights Legend

Use, duplication, or disclosure by the United States Government is subject to restrictions as set forth in subparagraph

(c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013.

Notice for All Other Executive Agencies

Notwithstanding any other license agreement that may pertain to, or accompany the delivery of, this computer software,

the rights of the United States Government regarding its use, reproduction, and disclosure are as set forth in the Commercial

Computer Software-Restricted Rights clause at FAR 52.227-19.

Trademarks of Bay Networks, Inc.

Annex, Remote Annex, Annex Manager, Remote Annex 2000, Remote Annex 4000, Remote Annex 6100, Remote Annex

6300, Remote Annex 5390/Async, Remote Annex 5391/CT1, Remote Annex 5393/PRI, BayStack Remote Annex 2000

Server, 5399 Remote Access Concentrator, Quick2Config, Bay Networks, Bay Networks Press, and the Bay Networks

logo are trademarks of Bay Networks, Inc.

Third Party Trademarks

All other trademarks and registered trademarks are the property of their respective owners.

Statement of Conditions

In the interest of improving internal design, operational function, and/or reliability, Bay Networks, Inc. reserves the right

to make changes to the products described in this document without notice.

Bay Networks, Inc. does not assume any liability that may occur due to the use or application of the product(s) or circuit

layout(s) described herein.

In addition, the program and information contained herein are licensed only pursuant to a license agreement that contains

restrictions on use and disclosure (that may incorporate by reference certain limitations and notices imposed by third

parties).

Model 5399 RAC Digital Modem Configuration Notes

Revision Level History

Revision Description

A

Initial Release.

Model 5399 RAC Digital Modem Configuration Notes

iModel 5399 RAC Digital Modem Configuration Notes

Contents

Custom Modem Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Using the %digital_modem Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Setting Parameter Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Standard Digital Modem Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

U.S. Operation, V.42bis Primary/MNP5 Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

U.S. Operation, Disable V.42bis Compression (V.42 only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

U.S. Operation, MNP5 Primary: V.42/V.42bis Disabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

U.S. Operation, Disable V.34 Extended Speeds (33.6 Kbps). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

International Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Parameter Maps and Option Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Parameter 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Parameter 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Parameter 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Parameter 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Parameter 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Parameter 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Parameter 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Parameter 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Parameter 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Parameter 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Parameter 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Parameter 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Parameter 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Parameter 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Parameter 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Parameter 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Parameter 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Parameter 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Parameter 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Parameter 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Parameter 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Parameter 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Parameter 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Parameter 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Parameter 24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Parameter 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Parameter 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Parameter 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Parameter 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Parameter 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Parameter 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Parameter 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Parameter 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Parameter 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Parameter 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Parameter 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Parameter 36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Parameter 37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Model 5399 RAC Digital Modem Configuration Notes

ii

Parameter 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Parameter 39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Parameter 40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Parameter 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Parameter 42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Parameter 43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Parameter 44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Parameter 45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Parameter 46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Parameter 47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Parameter 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Parameter 49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Parameter 50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Parameter 51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Parameter 52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Parameter 53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Parameter 54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Parameter 55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Parameter 56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Parameter 57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Parameter 58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Parameter 59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Parameter 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Parameter 61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Parameter 62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Parameter 63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

1Model 5399 RAC Digital Modem Configuration Notes

Model 5399 RAC Digital Modem

Configuration Notes

T

his document describes parameters used to configure the 5399

RAC’s digital modems. These parameters are set using “config_bytes”

entries in the %digital_modem section of the config.annex file.

Custom Modem Configuration

For normal operation, digital modems do not require custom

configuration as described here. These configuration instructions are

provided for users who have a compelling need to alter the digital

modems’ behavior at a basic level.

Using the %digital_modem Section

The %digital_modem section of the config.annex file can be used to

establish user-defined modem types and modify the digital modem

configuration parameters described in this document.

An example of the %digital_modem section follows below:

%wan

begin_session credit_card

called_no 103

call_action modem

set type_of_modem credit_card

end_session

%digital_modem

type_of_modem credit_card

config_bytes 16 =15,15,7,7

end

Parameters 26 through 63 are provided for use by qualified modem

engineers only. Changing these parameters from their default

settings could cause unexpected negative results, and is

discouraged.

Model 5399 RAC Digital Modem Configuration Notes

Setting Parameter Values

2

In this example, when the 5399 RAC receives a call on a number that

ends with 103, the call is treated as a modem call, with a user-defined

modem type named credit_card. Before the modem answers the call, its

digital modem configuration parameters 16, 17, 18, and 19 are set to the

values 15, 15, 7, and 7, respectively. This sets the options Maximum Tx

Line Speed and Maximum Rx Line Speed to Speed 31200, and the options

Minimum Tx Line Speed and Minimum Rx Line Speed to Speed 4800.

Setting Parameter Values

You can modify a digital modem configuration parameter by specifying

the parameter number and its corresponding value in the

%digital_modem section of the config.annex file. You can modify a

series of parameters by specifying the number of the first parameter in

the series, then specifying the corresponding values for all of the

parameters in that series.

Each parameter’s value is a decimal , octal, or hexadecimal number that

is the equivalent of the parameter’s binary bit settings; the config_bytes

keyword does not use values expressed in binary. Decimal is the default

base for setting parameter values. If you set values in octal base, precede

them with “0”; if you set values in hexadecimal base, precede them with

“0x”. Each parameter value in a series may be set separately, so it is not

necessary to use the same base for a single series of configuration

parameters.

For example, the parameter map for Parameter 3 on page 11 shows that

the default setting for the parameter is 11101 expressed in binary; this

value is 29 expressed in decimal, 035 in octal, and 0x1D in hexadecimal.

Changing the MNP Frame Size option to Block Size 64 causes the bit

setting to be 00101, or 5 in decimal, 05 in octal, and 0x5 in hexadecimal.

The corresponding config_bytes entry in the %digital_modem section

looks like this (with the parameter’s value expressed in decimal base):

config_bytes 3 =5

3

U.S. Operation, V.42bis Primary/MNP5 Secondary

Model 5399 RAC Digital Modem Configuration Notes

Standard Digital Modem Configurations

This section describes five standard digital modem configurations. Each

description lists certain parameters and options which must be set a

particular way for the modem to operate correctly.

U.S. Operation, V.42bis Primary/MNP5 Secondary

Parameter 0:

L: LAPM - Enabled (Default)

M: MNP - Disabled (Default)

B: Buffer - Enabled (Default)

Parameter 1:

D: V42 Detection - Enabled (Default)

Parameter 2:

T: Tx V.42bis - Enabled (Default)

R: Rx V.42bis - Enabled (Default)

M: Max String Length - String Length 16 (Default. Setting the option

to other values may cause unexpected results.)

D: Dictionary Size - Dictionary Size 2048 (Default)

Parameter 3:

C: MNP Class - Class 5 (Default)

B: MNP Frame Size - Frame Size 256 (Default)

Parameter 21:

Modulation - V34+ (bit rates up to 33.6Kbps) (Default)

Parameter 30:

A/µ: Compander Type 1 - µ (mu) law (Default)

This is the digital modems’ default configuration. No

config_bytes entries are needed to enable this configuration.

Model 5399 RAC Digital Modem Configuration Notes

U.S. Operation, Disable V.42bis Compression (V.42 only)

4

Parameter 31:

m1: v34 Full Duplex - Enabled (Default)

Parameter 33:

TrC: Trellis Coding - 4D 16 States (Default)

Parameter 34:

V8: V8 Handshake - Enabled (Default)

E: V34 Extension - v.34 Extended (Default)

U.S. Operation, Disable V.42bis Compression

(V.42 only)

Leave all parameter options set to their default values except:

Parameter 2:

T: Tx V.42bis - Disabled (Not Default)

R: Rx V.42bis - Disabled (Not Default)

required config_bytes setting:

config_bytes 2 =4

U.S. Operation, MNP5 Primary: V.42/V.42bis

Disabled

Leave all parameter options set to their default values except:

Parameter 0:

L: LAPM - Disabled (Not Default)

required config_bytes setting:

config_bytes 0 =4

Although other parameters affect V.42 operation, only

parameter 0 needs to be changed to disable V.42 operation

completely.

5

U.S. Operation, Disable V.34 Extended Speeds (33.6 Kbps)

Model 5399 RAC Digital Modem Configuration Notes

U.S. Operation, Disable V.34 Extended Speeds

(33.6 Kbps)

Leave all parameter options set to their default values except:

Parameter 21:

Modulation - V34 (bit rates up to 28.8Kbps) (Not Default)

required config_bytes setting:

config_bytes 21 =1

International Operation

Leave all parameter options set to their default values except:

Parameter 30:

A/µ: Compander type - A law (Not Default)

required config_bytes setting:

config_bytes 30 =1

Parameter Maps and Option Settings

The default settings for each parameter are shown in binary in the map

for the parameter and are displayed in bold in the description for each

option. All settings are listed as binary values.

Unused and reserved bits are shaded in the parameter maps.

Model 5399 RAC Digital Modem Configuration Notes

Parameter 0

6

Parameter 0

Default config_bytes setting:

Decimal base: 5

Octal base: 05

Hexadecimal base: 0x5

L: LAPM - When this option is enabled, the modem attempts to establish

a Link Access Protocol for Modems (LAPM) connection. This is the

link protocol used by V.42 for error correction. Disabling this option

prevents V.42 or V.42bis operation. In this case, an MNP (Microcom

Networking Protocol) connection or Buffer mode connection is made

if the corresponding option is enabled.

0: Disable

1: Enable

M: MNP - (MNP is not available in the first release.) When this option

is enabled, the modem attempts to establish a Microcom Networking

Protocol connection. As with LAPM, disabling MNP prevents an

MNP connection from being made. The modem then attempts to make

a V.42 connection (if enabled) or a Buffer mode connection as a last

resort.

0: Disable

1: Enable

B: Buffer - This option enables or disables data buffering.

0: Disable - Data is not buffered and speed conversion is not allowed.

1: Enable - Buffers about one screenfull of data between the DTE and

the modem.

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1

Descr.

Unused Reserved T B M L

Modem connections will not be successful if all three options (L,

M, and B) are disabled.

7

Parameter 1

Model 5399 RAC Digital Modem Configuration Notes

Parameter 1

Default config_bytes Setting:

Decimal base: 13

Octal base: 015

Hexadecimal base: 0xD

D: V42 Detection - (Changing this option from its default value is not

recommended.) This option causes the modem to skip the V.42

detection phase. It may be required for compatibility with some older

non-standard modems that expect V.42 detection to be performed

during the V.8 sequence.

0: Disable

1: Enable

B: V42 Break - A break is an attention key provided on some keyboards

for interrupting a transmission from a host. Breaks were widely used

by terminals communicating with mainframe computers, but are

rarely used in modern applications such as Internet browsing. A break

character consists of several character periods of constant Space bits.

Table 1 and Table 2 below describe how the modem handles a break

character:

0: Disable - Will not forward a break

1: Destructive/Expedited

10: Nondestructive/Expedited

11: Nondestructive/Nonexpedited

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1

Descr.

Unused Reserved SR B D

Model 5399 RAC Digital Modem Configuration Notes

Parameter 1

8

Table 1 Transmitting DCE Break Handling with Respect to Data

Break Handling

Option

Going to Remote DCE Going to local

DTE

Coming from

remote DCE

Coming from local

DTE

Destructive/

Expedited *

Complete data

transmission in

progress,then transmit

break. Discard data not

yet transmitted.

Discard data

not yet delivered.

Discard data until

acknowledgement

received.

Discard data until

acknowledgement

received.

Non-destructive/

Expedited

Complete data

transmission in

progress, then transmit

break.

Hold data until receive

acknowledgment.

Continue

delivering data.

Continue receiving

data.

Continue receiving

data.

Non-destructive/

Non-expedited

Wait for

acknowledgment of

data previously

transmitted, and then

transmit break.

Hold data until

acknowledgment

received.

Continue

delivering data.

Continue receiving

data..

Continue receiving

data.

All state variables pertaining to control function and error control function operation, except those pertaining to

break transfer, are reset to their initial values.

DCE: Data Communications Equipment (MODEM) DTE: Data Terminal Equipment (PC)

9

Parameter 1

Model 5399 RAC Digital Modem Configuration Notes

SR: Selective Retransmission - This option supports the ability to

retransmit a single frame that was received in error without having to

retransmit the entire series of frames that contained the distorted

packet. For example, assume the receiving modem identified frame 5

as bad and is not able request a retransmission until frame 8 has been

transmitted. With selective retransmission turned off, the transmitting

modem must retransmit frames 5 through 8. With selective

transmission on, frame 5 could be retransmitted alone and the

receiving modem would place it back into the proper sequence. This

results in a more efficient, slightly faster exchange of data.

0: Disable

1: Enable

Table 2 Receiving DCE Break Handling with Respect to Data

Break Handling Option Going to Remote DCE Going to local DTE

Destructive/ Expedited * Discard data not yet transmitted. Discard data not yet delivered.

Deliver break signal.

Non-Destructive/Expedited No effect. Deliver break signal

immediately.

Resume normal data delivery.

Non-Destructive/

Non-Expedited

No effect. Deliver break signal in sequence

with respect to data.

All state variables pertaining to control function and error control function, except those pertaining to

break transfer, are reset to their initial value.

For all break options, acknowledgment should be returned as soon as possible.

DCE Data Communications Equipment (MODEM) DTE Data Terminal Equipment (PC)

Model 5399 RAC Digital Modem Configuration Notes

Parameter 2

10

Parameter 2

Default config_bytes Setting:

Decimal base: 7

Octal base: 07

Hexadecimal base: 0x7

T: Tx V.42bis - V.42bis is the extension to V.42 that provides data

compression. This parameter allows the modem to selectively disable

compression in the transmitting direction.

0: Disable

1: Enable

R: Rx V.42bis - V.42bis is the extension to V.42 that provides data

compression. This parameter allows the modem to selectively disable

compression in the receiving direction.

0: Disable

1: Enable

M: Max String Length - This parameter defines the maximum number

of consecutive characters that are stored in the V.42bis dictionary. It

optimizes the dictionary, and therefore compression, for different data

types.

0: String Length 6

1: String Length 16

10: String Length 32

11: String Length 64

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1

Descr.

Unused Reserved D M R T

11

Parameter 3

Model 5399 RAC Digital Modem Configuration Notes

D: Dictionary Size - The dictionary stores recurrent data patterns which

are used in V.42bis data compression. As a rule, the larger the

dictionary, the better the modem is able to compress data. Both

modems attempting to make a connection must use the same dictionary

size and will use the largest dictionary available to both modems. The

first digital modem release supports a dictionary of 512 bytes only.

0: Dictionary Size 512 bytes

1: Dictionary Size 1024 bytes

10: Dictionary Size 2048 bytes

Parameter 3

Default config_bytes Setting:

Decimal base: 29

Octal base: 035

Hexadecimal base: 0x1D

C: MNP Class - This option limits MNP operation to the specified MNP

class or lower. Classes 1 through 4 support error correction only, while

class 5 also supports data compression. Some early MNP-only

modems improperly negotiate MNP class and may require the host

modem to disable higher classes of operation.

0: Unused

1: Class 1

10: Class 2

11: Class 3

100: Class 4

101: Class 5

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1

Descr.

Unused Reserved B C

Model 5399 RAC Digital Modem Configuration Notes

Parameter 4

12

B: MNP Frame Size - This option specifies the maximum MNP frame

size. It also allows operation with very early implementations of MNP.

Note that V.42 (LAPM) frame size is fixed at 128 bytes.

0: Block Size 64

1: Block Size 128

10: Block Size 192

11: Block Size 256

Parameter 4

Parameter 5

Parameter 6

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Descr.

Unused Reserved

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Descr.

Unused Reserved

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Descr.

Unused Reserved

13

Parameter 7

Model 5399 RAC Digital Modem Configuration Notes

Parameter 7

Parameter 8

Default config_bytes Setting:

Decimal base: 45

Octal base: 055

Hexadecimal base: 0x2D

Wait CD Time: The modem waits for a carrier for the specified number

of seconds; the default value is 45 seconds. If a carrier is not received

within this time, the modem hangs up and reports:

Message: No carrier

Disconnect reason: CD Timer

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Descr.

Unused Reserved

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 1

Descr.

Unused Wait CD Time

Model 5399 RAC Digital Modem Configuration Notes

Parameter 9

14

Parameter 9

Default config_bytes Setting:

Decimal base: 20

Octal base: 024

Hexadecimal base: 0x14

Retrain Timeout: The modem enters a retrain and waits for completion

and reconnection for the time selected (the default is 20 seconds). If

a carrier is not received within this time, the modem hangs up and

reports:

Message: No carrier

Disconnect reason: Retrain timeout

Parameter 10

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0

Descr.

Unused Retrain Timeout

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Va lue

0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0

Descr.

Unused Reserved

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Bay Networks 5399 Configuration Notes

Bay Networks 5399 Configuration Notes

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