B-8

 

APPENDIX B: AT COMMANDS, S REGISTERS, AND RESULT CODES

 

 

 

Table B-2

S Registers (continued)

 

 

 

Registers

Descriptions

 

 

 

S79

Call Drop:

 

 

0 — Disabled

 

 

62 — (default)

S80*

Multilink PPP:

 

 

0

— Disabled

 

 

1

— Enabled (default)

S82*

Multilink PPP Endpoint Discriminator Class:

 

 

The 3C882 ISDN modem automatically sets the Endpoint Discriminator Class

 

 

to 5.

 

 

1

— Locally Assigned Address

 

 

2

— Internet Protocol (IP) Address

 

 

3

— IEEE 802.1 Globally Assigned MAC Address

 

 

4

— PPP Magic-Number Block

 

 

5

— Public Switched Network Directory Number (default)

S83*

Multilink PPP Endpoint Discriminator Value (up to 20 characters)

 

 

By default, the 3C882 ISDN modem automatically sets the Endpoint

 

 

Discriminator value to the first telephone number. If your endpoint identifier

 

 

class is not 5, obtain the identifier from your service provider and enter that

 

 

information in this register.

S84

Challenge Handshake Authentication Protocol (CHAP)

 

 

0— Enabled

 

 

1— Disabled (default)

 

 

 

 

*The values of these S registers are stored in nonvolatile memory and will not be cleared or returned to the default value if the ISDN modem is powered down.

†Users of Pacific Bell ISDN service may need to set S registers 77, 78, and 79 to specific values. Check with Pacific Bell for the appropriate configurations.