# References

For more information about MIB support for cOCx/STMx interfaces, consult the following resources:

- RFC 1661—The Point-to-Point Protocol (PPP) (July 1994)
- RFC 2495—Definitions of Managed Objects for the DS1, E1, DS2 and E2 Interface Types (January 1999)
- RFC 2496—Definitions of Managed Objects for the DS3/E3 Interface Types (January 1999)
- RFC 2558—Definitions of Managed Objects for the SONET/SDH Interface Type (March 1999)

For more information about APS/MSP, consult the following resources:

- Telcordia document GR-253—Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria, Revision 3 (September 2000)
- ITU-T G.783—Characteristics Of Synchronous Digital Hierarchy (SDH) Multiplexing Equipment Functional Blocks: Annex A – Multiplex Section Protection (MSP) Protocol, Commands And Operation (1990)
- Definitions of Managed Objects for SONET Linear APS Architectures—draft-ietf-atommib-sonetaps-mib-05.txt (November 2001 expiration)
- RFC 3498—Definitions of Managed Objects for Synchronous Optical Network (SONET) Linear Automatic Protection Switching (APS) Architectures (March 2003)

For more information about bit error rate test (BERT) patterns, consult the following resources:

- ITU O.151—Error performance measuring equipment operating at the primary rate and above (October 1992)
- ITU O.153—Basic parameters for the measurement of error performance at bit rates below the primary rate (October 1992)
- T1M1.3 Working Group—A Technical Report on Test Patterns for DS1 Circuits (November 1993)
- ANSI T1.404-1994 Standard for Telecommunications—Network-to-Customer – DS3 Metallic Interface Specification (1994)

For more information about MDL/FDL support on cOCx/STMx interfaces, consult the following resources:

- ANSI T1.107a-1990 Standard for Telecommunications—Digital Hierarchy – Supplement to Formats Specification (August 1990)
- ANSI T1.403-1989 Standard for Telecommunications—Network and Customer Installation Interfaces – DS1 Metallic Interface – Robbed-bit Signaling State Definitions (1989)
- AT&T Technical Reference 54016—Requirements for Interfacing Digital Terminal Equipment to Services Employing the Extended Superframe Format (September 1989)