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Chapter 1
Overview
To calculate link losses and dispersion losses for your application, refer to the following specifications
and documents:
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Network Management Support
Following is the protocol and MIB support for the Cisco PA-POS-2OC3:
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Encapsulation Method Support
The following encapsulation methods are supported by the Cisco PA-POS-2OC3:
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Using Statistics to Estimate Link Loss and Power Budget
Statistical models more accurately determine the power budget than standard worst-case methods.
Determining the link loss with statistical methods requires accurate knowledge of variations in the data
link components. Statistical power budget analysis is beyond the scope of this document. For further
information, refer to ITU-T standards and your equipment specifications.
The following publications contain information on determining attenuation and power budget:
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OL-3028-06
EIA/TIA-IVa Dispersion Unshifted Single-Mode Fiber
EIA-TIA-IVb Dispersion Shifted Single-Mode Fiber
GR-20-CORE, Generic Requirements for Optical Fiber and Fiber-Optic Cable
ITU-T Recommendation G.957, Optical Interfaces for Equipment and Systems Relating to the
Synchronous Digital Hierarchy
SNMP agent v1 (RFC 1155-1157)
MIB II (RFC 1213); POS MIB support is available with Cisco IOS Release 12.0
RFC 1619 Point-to-Point Protocol over SONET/SDH
We recommend that you refer to the Internet Draft Enabling Transparency for the PPP over
SONET/SDH Mapping, which is recognized by the Internet Engineering Task Force (IETF) and
Internet Engineering Steering Group (IESG) as an approved addendum to RFC 1619.
High-Level Data Link Control (HDLC)
Frame Relay
T1E1.2/92-020R2 ANSI, the Draft American National Standard for Telecommunications entitled
Broadband ISDN Customer Installation Interfaces: Physical Layer Specification.
Power Margin Analysis, AT&T Technical Note, TN89-004LWP, May 1989.
PA-POS-2OC3 Two-Port Packet-over-SONET Port Adapter Installation and Configuration
Using Statistics to Estimate Link Loss and Power Budget
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