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Ppp Over Simple Data Link (Sdl) Using Sonet/Sdh with Atm-Like Framing

By Carlson, J.

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Book Id: WPLBN0000693597
Format Type: PDF eBook
File Size: 63.08 KB.
Reproduction Date: 2005

Title: Ppp Over Simple Data Link (Sdl) Using Sonet/Sdh with Atm-Like Framing  
Author: Carlson, J.
Volume:
Language: English
Subject: Probability Theory, Mathematical Statistics, Commercial Law
Collections: Technical eBooks Collection
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Carlson, J. (n.d.). Ppp Over Simple Data Link (Sdl) Using Sonet/Sdh with Atm-Like Framing. Retrieved from http://members.worldlibrary.net/


Description
Technical Reference Publication

Excerpt
Introduction: The Path Signal Label (SONET/SDH overhead byte named C2; referred to as PSL in this document) is intended to indicate the type of data carried on the path. This data, in turn, is referred to as the SONET Synchronous Payload Envelope (SPE) or SDH Administrative Unit Group (AUG). The experimental PSL value of decimal 207 (CF hex) is currently [3] used to indicate that the SPE contains PPP framed using RFC 1662 Octet Synchronous (O-S) framing and transmission without scrambling, and the value 22 (16 hex) is used to indicated PPP framed using O-S framing and transmission with ATM-style X^43+1 scrambling. This document describes a method to enable the use of SDL framing for PPP over SONET/SDH, and describes the framing technique and requirements for PPP. While O-S framing on SONET/SDH has a fixed seven octet overhead per frame plus a worst-case overhead of 100% of all data octets transmitted, SDL has a fixed eight octet per frame overhead with zero data overhead. Unlike O-S framing, SDL also provides positive indication of link synchronization.

Table of Contents
Table of Contents 1. Introduction ............................................... 4 2. Compliance ................................................. 4 3. Physical Layer Requirements ................................ 5 3.1. Payload Types ............................................ 5 3.2. Control Signals .......................................... 6 3.3. Synchronization Modes .................................... 7 3.4. Simple-Data-Link LCP Option .............................. 7 3.5. Framing .................................................. 8 3.6. Framing Example .......................................... 11 3.7. Synchronization Procedure ................................ 11 3.8. Scrambler Operation ...................................... 12 3.9. CRC Generation ........................................... 12 3.10. Error Correction ........................................ 13 4. Performance Analysis ....................................... 14 4.1. Mean Time To Frame (MTTF) ................................ 14 4.2. Mean Time To Synchronization (MTTS) ...................... 15 4.3. Probability of False Frame (PFF) ......................... 16 4.4. Probability of False Synchronization (PFS) ............... 16 4.5. Probability of Loss of Frame (PLF) ....................... 16 5. The Special Messages ....................................... 16 5.1. Scrambler State .......................................... 17 5.2. A/B Message .............................................. 17 6. The Set-Reset Scrambler Option ............................. 17 6.1. The Killer Packet Problem ................................ 17 6.2. SDL Set-Reset Scrambler .................................. 18 6.3. SDL Scrambler Synchronization ............................ 18 6.4. SDL Scrambler Operation .................................. 19 7. Configuration Details ...................................... 20 7.1. Default LCP Configuration ................................ 20 7.2. Modification of the Standard Frame Format ................ 21 8. Implementation Details ..................................... 21 8.1. CRC Generation ........................................... 21 8.2. Error Correction Tables .................................. 23 9. Security Considerations .................................... 25 10. References ................................................ 25 11. Acknowledgments ........................................... 26 12. Working Group and Chair Address ........................... 26 13. Intellectual Property Notices ............................. 26 14. Authors' Addresses ........................................ 27 15. Full Copyright Statement .................................. 28 5

 

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