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