3Com 5210 manual Glossary

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GLOSSARY

This appendix lists acronyms and terminology used in the CommWorks VoIP application.

A-LinkAccess link. SS7 Signaling link used to connect the Signaling Transfer Point (STP) and Signaling Switch Point (SSP).

ACF Admission Confirm—This is a call flow message.

AMI Alternate Mark Inversion—A line encoding scheme for transmitting data bits over T1 and E1transmission systems.

ANI Automatic Number Identification—The billing number of the person making the phone call. ANI allows the calling party to be billed without having to enter a PIN.

ARJ Admission Reject—This is a call flow message.

ARQ Admission Request—This is a call flow message.

AIS Alarm Indication Signal—Formerly referred to as a ‘blue alarm’ or ‘blue signal’. This is a signal that is created when a maintenance alarm indication has been activated. This signal is transmitted downstream informing that an upstream failure has been detected.

AS Autonomous System—An independent system.

AUX Auxiliary—Backup or acting as a redundancy on the system.

B8ZS Binary Eight Zero Code Suppression—Line-code type, used on T1 and E1 circuits. A special code replaces any eight consecutive zeros that are sent over the link. This code is then interpreted at the remote end of the connection. This technique guarantees ones density independent of the data stream. Sometimes this is referred to as bipolar 8-zero substitution.

BHCA Busy Hour Call Attempts—The number of calls attempted within 60 minutes during the busiest times during the day.

CCCountry Code—When calling outside of the country, the called number consists of the country code, identifying the country where the person to be called resides and a NSN (National Significant Number). The code of the country is the first three digits dialed.

CCS Common Channel Signal—This is a Bellcore definition: A network architecture which uses Signalling System 7 (SS7) protocol for the exchange of information between telecommunications nodes and networks on an out-of-band basis.