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61202.086L1-1 ISU 512 User Manual
7
Chapter 2
Ordering ISDN
ISDN is a complex service with many network options. Obtaining service
from the local telephone company and long distance providers can be compli-
cated.
The following instructions only apply to North American switches.
In North America, the development of ISDN Ordering Codes (IOCs) simplifies
the process of ordering ISDN service. The ISDN Solutions Group, a consor-
tium of ISDN equipment vendors, service providers, and Bellcore, established
these codes to represent predetermined line configurations for ISDN Basic
Rate service for specific applications.
ADTRAN and Bellcore have registered and tested eight generic IOCs. These
IOCs are supported by all major local exchange carriers as well as several in-
dependent carriers.
Capability S (
previously
Generic Data M)
ordering code is recommended for
ISU 512 applications. It is the most feature-rich and supports most voice and
data applications. The voice capability is not necessary for operation of the
ISU 512; however it is useful in troubleshooting a misconfigured ISDN line. In
some areas, ISDN tariffs may warrant the use of ordering codes with less fea-
tures. For example, in a particular region, there may be additional monthly ex-
pense associated with having voice service on each B channel. If you have a
data only application
Capability R
(previously
Generic Data I
) may be more
cost-effective. Each ISDN line provides 112/128 kbps of service. If 512 kbps is
needed for your application, order four ISDN lines. If 384 kbps is needed, only
order three ISDN lines, etc.