S Registers

B-7

Table B-2

S Registers (continued)

 

 

 

 

 

Registers

Descriptions

 

 

 

 

S71

B Channel Protocol:

 

 

0

— QuickSelect (default)

 

 

1

Async-Sync PPP conversion

 

 

2

— V.120

 

S73

V.120 Frame Type:

 

 

0

— I frame (default)

 

 

1

— UI frame

 

S74

V.120 Maximum Frame Size (range 240–256):

 

 

256 — Maximum frame size of 256 (default)

 

 

248 — Maximum frame size of 248 (for AdTrancompatibility, use 253)

S75

Connection Delay:

 

 

Specifies whether the ISDN modem immediately answers a call or waits 2

 

seconds to answer. If you are using Windows NT, use the two-second delay.

 

0

— No delay (default)

 

 

1

Two-second delay

 

S80*

Multilink PPP:

 

 

0

— Disable

 

 

1

— Enable (default)

 

S82*

Multilink PPP Endpoint Identifier Class:

 

 

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 Identifier (up to 20 characters)

 

 

By default, telephone number 1 is sent because the endpoint identifier class

 

is 5. 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 non-volatile memory and will not be cleared or returned to the default value if the ISDN modem is powered down.

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3Com 3C882 manual S75 Connection Delay