3Com ISDN Modem Locally Assigned Address, Internet Protocol IP Address, PPP Magic-Number Block

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.