AT&T Technical Reference 54078 (November 1998)
TR 54078, November 1998
AT&T Private Line Service OC-48 Service Description and
Interface Specification
Scope
This Technical Reference provides Network Interface (NI) and Point of
Interface (POI) Specifications for the AT&T Private Line OC-48 (Optical
Carrier Level 48) Service. The document includes a description of the service,
technical parameters, physical interface requirements, logical interface
requirements, and other necessary criteria for connecting Customer Premises
Equipment (CPE) and/or access to AT&T OC-48 circuits to obtain the
performance characteristics identified herein. OC-48 service features optical
interfaces at the NI and the POI.
Organization
Section 1 – Provides the purpose and organization of this
document.
Section 2 – Provides an overview description of the
AT&T Private Line OC-48 Service.
Section 3 – Provides availability and error performance
parameters.
Section 4 – Provides interface specifications.
Section 5 – Provides synchronization and timing
specifications.
Section 6 – Provides network alarm and status
conditions.
Section 7 – Provides customer premises equipment
characteristics.
Section 8 – Provides testing and maintenance
requirements.
Section 9 – Provides references to related documents.
Services
The AT&T Private Line Service (APLS) OC-48 Inter-Office Channel (IOC)
Service is a service that provides dedicated point-to-point 2488.32 Megabits
per second (Mbps), or 2.48 Gbps, line rate digital service for STS-48/48c
(Synchronous Transport Signal Level 48/48 concatenated) signals. A
point-to-point service is defined as a two-way service where traffic originates
(or terminates) in one location and terminates (or originates) in the other.
Besides STS-48c signals, the OC-48 IOC may be comprised of STS-1 (Synchronous
Transport Signal Level 1), and/or STS-3c (Synchronous Transport Signal Level 3
concatenated), and/or STS-12c (Synchronous Transport Signal Level 12
concatenated) tributary signals as required per customer application. The
differences between the line rates and effective customer payloads are due to
bits reserved for SONET overhead signaling. OC-48 service features optical
interfaces at the NI and the POI.
ISDN Vendor testing program is currently suspended