Glossary
Centillion 1200N ATM Switch User Manual B-5
NTP 297-8103-903
AIMUX
ATM Inverse Multiplexing: A device that allows multiple T1 or E1
communications facilities to be combined into a single broadband facility for the
transmission of ATM cells.
AIR
Additive Increase Rate: An ABR service parameter, AIR controls the ra te at which
the cell transmission rate increases. It is signaled as AIRF, where AIRF =
AIR*Nrm/PCR.
AIRF
Additive Increase Rate Factor: Refer to AIR.
AIS
Alarm Indication Signal: An all ones signal sent down or up stream by a device
when it detects an error condition or receives an error condition or receives an error
notification from another unit in the transmission path.
Alternate Routing
A mechanism that supports the use of a new path after an attempt to set up a
connection along a previously selected path fails.
ALT
Alternative Access Providers to the local telephone network i.e., Teleport.
AMI
Alternative Mark Inversion: The line-coding format in T-1 transmission systems
whereby successive tones (marks) are alternately inverted (sent with polarity
opposite that of the preceding mark).
Ancestor Node
A logical group node that has a direct parent relationship to a given n ode (i .e., it is
the parent of that node, or the parent's parent...).
ANI
Automatic Number Identification: A charge number parameter that is normally
included in the Initial Address Message to the succeeding carrier for billing
purposes.