Netgear XM128 ISDN User Manual Page 148

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Reference Guide for the Model XM128 ISDN Digital Modem
G-4 ISDN Reference
Not all the interfaces must exist in actual implementations. For example, not all houses are
equipped with a PBX (NT2). In this case, the U interface is provided by the NT-1 device.
An ISDN terminal adapter can be constructed with the functionality of an NT-1 device. In this
case, the terminal adapter connects directly to the U interface. The Model XM128 modem
connects directly to a U interface without an NT-1 device, which can sometimes be quite
expensive.
The Model XM128 modem comes with the following two different types of interfaces:
An S/T interface
The Model XM128 modem with an S/T interface is called a Model XM128S modem and
requires an NT-1 device to be connected between the modem and the ISDN wall connection.
A U interface for American ISDN
The Model XM128 modem with a U interface is called a Model XM128U modem and can be
connected directly to the ISDN jack installed by the telephone company.
SPID Setup
Service provider identification (SPID) numbers are needed unless your switch type is AT&T 5ESS
with Point-to-Point Protocol. The ISDN switches use SPID numbers to represent the subscribed
network services. Each SPID number corresponds to one terminal end point identifier. Different
switches might provide different rules for the SPID number format. You should get the SPID
number from your local telephone company.
Ordering ISDN Service
This section provides information about ordering an ISDN line from your telephone company.
Follow these guidelines and use the information to fill in the appropriate worksheet in this
appendix:
Provide the following ISDN codes to the telephone company:
–S
EZ-ISDN-1
Each code describes a set of capabilities and features that are available in the
Model XM128 modem. Providing these codes ensures that your ISDN line is installed
for maximum compatibility.
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