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Reference Guide for the Model RT210/RT211 ISDN Routers
Service Profile Identifier
subnet mask
U Interface
unnumbered links
WAN
Wide Area Network
4
A number assigned by the telephone company to an attached device,
used to identify the characteristics of that device.
A number that explains which part of an IP address comprises the
network address and which is a subnet of host addresses. Can be
expressed in the form of the IP address or as a number appended to the
IP address. For example, a 28-bit mask starting from the MSB can be
shown as 255.255.255.192 or as /28 appended to the IP address.
The two-wire ISDN interface or reference point at the telephone
company side of the NT1. See S/T interface.
A method of connecting two LANs via a WAN where the two WAN
end points do not have their own IP addresses.
See Wide Area Network.
A long distance link used to extend or connect remotely located Local
Area Networks.
Glossary
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Troubleshooting
