Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 333)

Access Manager 2000 Manual A-1
Appendix
A
Key Acronyms and Terms
Term Definition
A
A Ampere.
AC Alternating Current.
Acknowledged Alarm An alarm sent to Access Manager which has been acknowledged
manually by the user or automatically by the software.
Adjacent Channels If two channels are assigned so there is no unassigned channel between
them, these channels are said to be adjacent. (For example, if P ort1 =
Channels 2, 3, 5, 7-9 and Port 2 = Channels10, 2 4 ; then 2 is adjacent to
3, 7 is adjacent to 8, 8 is adjacent to 9, 9 is adjacent to 10, and 24 is
adjacent to 1.)
AIS See Alarm Indication Signal.
Alarm Indication
Signal An unframed ALL-ONEs bit pattern that indicates that an alarm
condition exists upstream in a circuit leading to the downstream
equipment. This is also called an ALL-ONEs Keep-Alive or Blue Alarm
Signal.
AISS See Alarm Indication Signal Second.
Alarm Indication
Signal Second A second during which the CSU receives an ALL-ONEs (AIS) code
from the network.
ALL-ONEs A signal on a DS-1 (T1) line which is comprised entirely of ones
(11111111). This signal is transmitted when there is an alarm condition
upstream on the network or as a keep-alive signal to the network from a
CSU.
Alternate Mark
Inversion A 1.544 Mbps signal in which successive ONEs (pulses) are normally
of alternating polarity and in which ZEROs (spaces) are of zero
amplitude.