Cabletron Systems HSIM-W87 manual Appendix C WAN Terms and Acronyms

Page 51

APPENDIX C

WAN TERMS AND ACRONYMS

This appendix provides definitions for WAN terms and acronyms.

AIS — Alarm Indication Signal, The DS3 AIS is framed with “stuck stuffing”. This implies that it has a valid M-subframe alignment bits, M-frame alignment bits, and P bits. The information bits are set to a

1010... sequence, starting with a one (1) after each M-subframe alignment bit., M-frame alignment bit, X bit, P bit, and C bit. The C bits are all set to zero giving what is called “stuck stuffing”. The X bits are set to one. The DS3 AIS defect is declared after DS3 AIS is present in contiguous M-frames for a time equal to or greater than T, where

0.2ms<=T<=100 ms. The DS3 AIS defect is terminated after AIS is absent in contiguous M-frames for a time equal to or greater than T.

AMI — Alternate Mark Inversion, line coding used with both E-1 and T1. A digital 1 is encoded as a “mark” (pulse) and a 0 is encoded as a “space.” The marks alternate polarity.

ANSI — American National Standards Institute, the US member of the ISO.

Bearer (B) Channel — A 64 Kbps channel used with BRI and PRI ISDN services.

BPV — Bipolar Violation, the occurrence of two successive pulses of the same polarity in a bipolar signal.

B3ZS — Bipolar with 3 Zero Substitution, an AMI line code with the substitution of a unique code to replace occurrences of three consecutive zero signal elements.

B8ZS — Binary 8-Zero Substitution, line coding utilized with ESF (Expanded Super Frame) using a bipolar DS1 signal. Insures the ones density requirement for digital T-carrier facilities in the public network, while allowing 64 Kbps clear data per channel. This encoding method is not supported by some Telcos.

BER — Bit Error Ratio, errored bits over total bits, should be <10–7 for transmission lines.

HSIM-W87 User’s Guide

C-1

Image 51
Contents HSIM-W87 Page HSIM-W87 User’s Guide Industry Canada Notice Cabletron Software Program License HSIM-W87 User’s Guide Contents Contents Using this Manual Chapter IntroductionImportant Notice Overview Imux Features Data Flow in the HSIM-W87Connectivity Inverse Multiplexing Imux Hdlc5 DS1 Alarm Priority QueuingSnmp and MIB Support Document Conventions Lanview Diagnostic LEDsBold type Related DocumentationYour email address Getting HelpHSIM-W87 User’s Guide Unpacking the HSIM-W87 Chapter InstallationInstalling the HSIM-W87 in an Interface Module Installing the HSIM-W87Installing the HSIM-W87 Installing the HSIM-W87 Installing the HSIM-W87 in a Standalone Device HSIM-W87 Setup Connecting the HSIM-W87 to the NetworkLanview Leds ChapterLanview LEDs Local Management Chapter ManagementManagement Network Tools Help CommandsCommand Imux Built-in CommandsImux 1 -ac 1 ExampleWanpq Command wanpqDs1alarm Command ds1alarm Syntax ds1alarmCommand dsx1 Dsx1 Command dsx3Dsx3 Options Special CommandsSyntax DescriptionImux 1 -ac 1 Sample Imux ConfigurationSample Imux Configuration Enabling the Imux Application Chapter Troubleshooting Troubleshooting the HSIM-W87Hardware Troubleshooting Status STS LED is OFF Problems with the Firmware Image Investigating Software Configuration ProblemsHSIM-W87 User’s Guide Appendix a Specifications Physical PropertiesEnvironmental Requirements Regulatory Compliance Appendix B Typical Configuration Appendix B Typical Configuration Appendix C WAN Terms and Acronyms Appendix C WAN Terms and Acronyms WAN Terms and Acronyms HSIM-W87 User’s Guide WAN Terms and Acronyms HSIM-W87 User’s Guide