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Feature Summary

Beneﬁts

The following are beneﬁts of using Modem over ISDN BRI:

•

Supports cost-effective and readily available BRI service

•

Provides remote modem users with rapid Internet and LAN/WAN access

•

Allows ﬂexible remote access application support

List of Terms

BRI—Basic Rate Interface. ISDN interface composed of two B channels and one D channel for

circuit-switched communication of voice, video, and data.

ISDN—Integrated Services Digital Network. Communication protocol, offered by telephone

companies, that permits telephone networks to carry data, voice, and other source trafﬁc.

NM—network module.

POTS—Plain Old Telephone Service. Basic telephone service supplying standard single-line

telephones, telephone lines, and access to the public switched telephone network.

PRI—Primary Rate Interface. ISDN interface to primary rate access. Primary rate access consists

of a single 64-Kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data.

PSTN—public switched telephone network. PSTN refers to the local telephone company.

SPID—service proﬁle identiﬁer. Number that some service providers use to deﬁne the services to

which an ISDN device subscribes. The ISDN device uses the SPID when accessing the switch that

initializes the connection to a service provider.

TEI—terminal endpoint identiﬁer. In ISDN, a number that identiﬁes a speciﬁc connection endpoint

within a service access point.

VIC—voice interface card.

WIC—wide-area network (WAN) interface card.

Restrictions

This feature requires speciﬁc hardware and software:

•

At least one of the digital modem network modules listed below—the number in the model name

indicates the number of digital modems that can be connected to the module.

— NM-6DM

— NM-12DM

— NM-18DM

— NM-24DM

— NM-30DM

These digital modem network modules do not have their own network connections, but instead

handle analog calls passing through other router interfaces. BRI modules can provide their ISDN

connectivity. Other modules, such as Ethernet, can provide connectivity to the LAN. The digital

modem module acts as a pool of available modems that can be used for both incoming and

outgoing calls. Digital modem network modules do not support BRI VIC or WIC interfaces.

Cisco IOS Release 12.0(3)T