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Equivalent
Status Line
Front Panel
Indicator Name
Name
SYN *
NNS
YEL *
AIS *
NLB
BPV
CRC *
TSY *
TNS
0'S
LAD
* In Unframed Mode, this status line indicator is not shown (it is removed from the status line) or this front panel LED is not
used (it remains OFF).
Note: The normal status is indicated by a period (.), while an abnormal condition is indicated by an X.
OPERATION
TABLE 3-1. STATUS LINE INDICATORS
SYN *
Network Synchronization — indicates whether the CSU is (.) or is not (X) syn-
chronized with network framing. (In Unframed Mode, there are no network framing
bits, so synchronization with the network cannot be assured and it is not monitored.)
NS
Network No Signal — indicates whether the CSU is (.) or is not (X) receiving a
network signal (a signal with loss greater than 28.5 dB for longer than 150 mil-
liseconds is considered no signal).
n/a
Yellow Alarm — indicates whether the CSU is (X) or is not (.) receiving a Yellow alarm
signal. In response to receiving a Yellow alarm from one side, the CSU transmits a
Yellow alarm to the other side, in the proper format (D4 or ESF). (In Unframed Mode,
the entire bandwidth is used for customer payload, so none is available to carry this
alarm information.)
AIS *
Alarm Indication Signal — indicates whether the CSU is (X) or is not (.) receiving an
AIS (a keep alive signal of all 1s). In response to receiving an AIS from one side, the
CSU returns a Yellow alarm, and transmits an AIS to the other side. (In Unframed
Mode, there are no network framing bits, so a keep alive signal is not indicated as an
alarm.)
LB
Network Loopback — indicates whether the CSU is (X) or is not (.) in a loopback test
toward the network.
BPV
Network Bipolar Violation — indicates whether the CSU has (X) or has not (.) re-
ceived a BPV.
n/a
Cyclic Redundancy Check — indicates whether the CSU has (X) or has not (.) re-
ceived a CRC error. (In Unframed Mode, the entire bandwidth is used for customer
payload, so this alarm information does not apply.)
n/a
Equipment Synchronization — indicates whether the CSU is (.) or is not (X) syn-
chronized with equipment framing. (In Unframed Mode, there are no equipment
framing bits, so synchronization with the equipment is not required.)
NS
Equipment No Signal — indicates whether the CSU is (.) or is not (X) receiving an
equipment signal (a signal with consecutive zeros for longer than 150 milliseconds is
considered no signal).
0'S
Equipment Zeros — indicates whether the CSU is (X) or is not (.) receiving an
excessive number of consecutive zeros. The threshold is dependent on the selec-
tion of the Ones Density option (maximum of 15 or 39 consecutive zeros).
LAD
Low Average Density — indicates whether the CSU is (X) or is not (.) receiving an
average pulse density less than that selected with the Ones Density option
(minimum of N "ones" per 8(N+1) bits).
3-11
Description
Network Indicators
Equipment Indicators
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