Glossary
Centillion 1200N ATM Switch User Manual B-3
NTP 297-8103-903
ACR
Attenuation to Crosstalk Ratio: One of the factors that limits the distance a signal
may be sent through a given media. ACR is the ratio of the power of the received
signal, attenuated by the media, over the power of the NEXT crosstalk from the
local transmitter, usually expressed in decibels (db). T o ach ieve a desi red bit error
rate, the received signal power must usual ly be several times larger than the NEXT
power or plus several db. Increasing a marginal ACR may decrease the bit error
rate.
ACR
Allowed Cell Rate: An ABR service parameter, ACR is the current rate in cells/sec
at which a source is allowed to send.
ACSE
Association Control Service Element
ACT
Applied Computer Technologies: A Hewlett Packard’s program that is a strategy
and set of open architecture commands and interfaces for integrating voice and
database technologies. The idea is that with ACT a call will arrive at the te lephone
simultaneously with the database record of the caller.
Address Filter
Address Prefix
A string of 0 or more bits up to a maximum of 152 bits that is the lead portion of
one or more ATM addresses.
Address Resolution
Address Resolution is the procedure by which a client associates a LAN destination
with the ATM address of another client or the BUS.
Adjacency
The relationship between two communicating neighboring peer nodes.
Administrative Domain
A collection of managed entities grouped for administrative reasons.