List Of Terms - Cisco 3640 User Manual

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.
2 Cisco IOS Release 12.0(3)T