Issue 8.0 July 2002 GL-1
Glossary
Numerics
0x1LineOperation
A 0x1 protection system has one service line and no protection line.
1+1LineProtection
A 1+1 protection system has two bidirectional lines. The transmitting terminal transmits the same
signal on two lines. The receiving terminal monitors two lines independently and chooses one line
as the active line and the other line as the standby line. When a protection switch occurs, the
receiving terminal selects the signal from the standby line which causes the standby line to be the
new active line. The original active line becomes the standby line. This status remains the same
(nonrevertive) after the fault clears.
1x1LineProtection
A 1x1 protection system has two OC-48 high speed lines. One line is designated as the service
line, and the other line is designated as the protection line. The service line normally carries traffic.
When a protection switch occurs, the protection line is selected to carry traffic. When the fault
clears, the original service line is selected (revertive). Also see Revertive Switching.
1xM Electrical Low Speed Interface Protection
1xM electrical low speed interface protection refers to a system with one protection electrical low
speed interface circuit pack (DS3 or STS1E) and up to 16 service electrical low speed interface cir-
cuit packs (DS3 or STS1E). When a low speed protection switch occurs, the electrical low speed
signals are routed from the service low speed interface circuit pack to the protection low speed
interface circuit pack. When the fault clears, the low speed signals are routed back to the service
low speed interface circuit pack (revertive). Also see Revertive Switching.
A
ABN
Abnormal — An LED on the user panel that is lighted when a temporary condition potentially affect-
ing transmission exists; for example, a CIT-initiated protection switch or lockout, or loopback.
ACO
Alarm Cutoff — A pushbutton switch on the user panel that can be used to retire the active audible
office alarm. If another alarmable condition occurs while the ACO is active, the highest level audi-
ble alarm is activated. The alarm cutoff function is also available from the CIT and from an opera-
tions system.
Active
Active refers to a 1+1 protected OC-3 line that is currently selected by the receiving terminal at
either end as the payload carrying signal. (Also refer to Standby.)
ADM
Add/Drop Multiplexer
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