
380 Appendix B: ISDN Overview
Enterprise Edge 2.0 Programming Operations Guide P0911588 Issue 01
If your system has both an EE-BRIM S/T configured as BRI, and an EE-DTM
configured as PRI, it is recommended that you use PRI as the primary clock source.
See PRI hardware on page 377.
Other ISDN BRI equipment
NT1
The NT1 (network termination type 1) connects an S interface (four-wire) to a U
interface (two-wire). In most cases, it connects loops from an EE-BRIM S/T
module to the network connection, which uses the Uinterface.
The NT1 converts and reformats data so it can be transmitted to and from the S or
T connection. In addition, it manages the maintenance messages travelling between
the network and the NT1, and between the NT1 and the Enterprise Edge system.
The NT1 from Nortel Networks is packaged two ways:
• a stand alone package which contains one NT1 card (NTBX80XX) and a power
supply (NTBX81XX)
• a modular package which contains up to 12 NT1 cards (NTBX83XX) and a
power supply (NTBX86AA)
ISDN standards compatibility
In North America, Enterprise Edge ISDN equipment supports National ISDN
standardsfor basic calland callinglineidentificationservices.Enterprise Edge BRI
is compliant with National ISDN-1 and PRI is compliant with National ISDN-2.
Enterprise Edge does not support EKTS (Electronic Key Telephone System) or
CACH (Call Appearance Call Handling).
In Europe, Enterprise Edge supports ETSI Euro and QSIG standards, and
PRI SL-1 protocol.
Planning your ISDN network
Consult the Enterprise Edge Installation and Maintenance Guide to determine a
configuration of ISDN trunks and terminal equipment (TE) for the Enterprise Edge
system, then order the appropriate ISDN capability package from your ISDN
service provider.
For ISDN BRI service your service provider supplies service profile identifiers
(SPIDs), network directory numbers (Network DNs), terminal endpoint identifiers
(TEIs), and other information as required to program your Enterprise Edge, TE and
other ISDN equipment.
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