Appendix F: Ordering ISDN Without IOCs61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 129LOCAL INTERFACE REQUIREMENTSPhysical Interface• ISDN Basic Rate Interface (BRI) line• U-interface reference point• 2B1Q line codingISDN service must be provided from one of the following COswitches and protocols:The interface provides the ability to allocate one dynamic (TEI)per phone number.Local Service• Bearer capabilities:- Circuit mode voice service for speech and 3.1 kHzaudio.- Circuit mode data service for 56 kbps and 64 kbpsunrestricted data.• Two simultaneous calls supported on the interface. Any mixof speech and data bearer capabilities is supported for bothbearer channels on incoming and outgoing calls.• Service provided inside the LATA for the bearer capabilities.• Long distance access for the bearer capabilities to and fromthe long distance providers of choice.Switch ProtocolAT&T 5ESS Custom (5E6 or later software)National ISDN-1Northern Telecom DMS-100 BCS-32 or later software (Pvc1)National ISDN-1 (Pvc2)Siemens EWSD National ISDN-1
