Verilink 2048 (34-00179) Product Manual - Manual (Page 19)

Operation 3-1 2048 PMU/NTU
BV/CR /FE
LOC FAR
ACO SW
ACO
LOS/LOF
AIS
REM ALM
LOC ALM
N
E
T D
T
E
T
S
T
LLB
PLB
TST
ERR
5
1
7
9 0
6
8 2
3
4
FRM
NET
MON
TO
DTE
TO
NET
MON
FRM
DTE
Operation
3.0 Introduction
This chapter contains the general operation instructions for
the TxPORT 2048 front panel. The unit is operated either
manually or through software control. Manual operation
consists of using the front panel (described in this chapter)
and the circuit board configuration switches (described in
the Installation chapter).
The Terminal Operation chapter covers the firmware con-
trolled Terminal Interface program, which gives the user the
maximum amount of control. The unit may also be con-
trolled using the TxPORT EM8000 element manager (refer
to the EM8000 reference manual).
3.1 Front Panel Descriptions
The 2048 PMU uses LED indicators to convey major alarm
conditions and looping status. The front panel contains 19
LED indicators, 2 test switches, a set of bantam test jacks,
and a supervisory port connector. The following paragraphs
describe these controls and indicators and are referenced to
the illustration on this page.
3.1.1 General Status Indicators
1) STATUS: The unit has two LED indicators on the
front panel bezel that are exposed whether the access door is
open or closed. These general status LEDs provide a quick
check of the unit’s operating condition (Go or No Go).
If neither LED is lit, the unit is not powered. If the green
LED is lit, the unit is powered and functioning normally. If
the red LED is lit, there is a line fault which exceeds alarm
thresholds or another type of unit failure. The problem can
be isolated by further examination of the other front panel
LEDs as described below.
2) Activity Indicators: These two small, recessed LEDs
are provided to indicate supervisory and network manager
port activity.
3.1.2 Alarm Controls and Indicators
3) ACO: This red LED lights whenever the ‘alarm cut
off’ switch is placed in the left ‘ON’ position. It indicates
that the alarm relay contacts are disabled.
4) ACO SW: The ‘alarm cut off’ switch controls the
alarm relay circuitry. If the switch is placed in the left ‘ON’
position, this circuitry is deactivated. The right ‘OFF’ posi-
tion enables the contacts to report alarm conditions.
5) BV/ CR / FE: This LED lights 1 second for each sec-
ond with an occurrence of bipolar violations (BPV), cyclic
redundancy check (CRC) errors, or frame bit errors (FBE).
6) LOS/ OOF: This red LED blinks with loss of signal
(LOS) from the network or DTE. It lights constantly when
an Out of Frame (OOF) condition is detected.
2048 PMU/NTU Front Panel
3
SW1
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2048
PMU/NTU
T R A N S P O R T
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