NEC PASOLINK Training Course page 14

DETECTING
ALARM CONDITION
CIRCUIT
AIS signal is sent
AIS (all logic "1") is received
Input data stream is lost
INTFC Transmitter clock is lost
Receiver clock is lost
Output data stream is lost
Setting error of traffic channel assignment for usage
TX 1/2 CLK is lost
SW BOARD
RX1/2 CLK is lost
LAN INTFC FE link down, selectable
Wayside input data stream is lost
Wayside AIS is received
WS INTFC
Wayside output data stream is lost
Wayside AIS is transmitted
WS INTFC Wayside channel usage error, selectable
DPU Output data stream or master clock signal is lost at the DPU (TX) circuit
MOD VCO synchronization is lost at the MOD circuit
Carrier synchronization is lost
DEM
IF input signal is lost
Frame synchronization is lost at the DPU (RX)
BER is worse than preset value (1 x 10
BER is worse than preset value (1 x 10
DPU
BER is worse than preset value (1 x 10
CPU communication error between IDU and ODU
Transmitter RF power decreases 3 dB from normal
Receiver input level decreases from squelch level at ODU
APC loop of local oscillator for transmitter or first local oscillator for receiver unlocks at ODU
ODU
APC loop of second local oscillator for receiver unlocks at ODU
IF signal from the IDU is lost at ODU
When the equipment is set to the Maintenance condition by PC.
When the equipment is set to the following condition by PC.
• FE loopback control condition
—
• NE loopback control condition
• MOD CW condition
• MUTE (TX output power) condition
• BER ALM >> AIS (off)
SW BOARD OPR SEL No.1-No.2 switch is set to No.1 or No.2 position.
Table 2-3 Alarm Indication and Reporting
−3
)
−6
)
−3 −4 −5 −6
, 1 x 10 , 1 x 10 or 1 x 10 , selectable)
LED INDICATION
ALARM INITIATED
ON IDU
AIS SEND —
IDU*2
AIS RCVD —
INPUT LOSS TX ALM ( )
TX CLK LOSS TX ALM ( )
RX CLK LOSS RX ALM ( )
OUTPUT LOSS RX ALM ( )
CHANNEL USAGE ERROR TX ALM ( )
TX IN CLK LOSS1/2 TX ALM 1/2
RX IN CLK LOSS1/2 RX ALM1/2
FE LINK DOWN LINK
WS INPUT LOSS TX ALM ( )
WS AIS RCVD TX ALM ( )
IDU*3
WS OUTPUT LOSS RX ALM ( )
WS AIS SEND RX ALM ( )
WS CHANNEL USAGE TX ALM ( )
TX DPU ALM TX ALM ( )
MOD ALM TX ALM ( )
DEM ALM RX ALM ( )
DEM ALM RX ALM ( )
F SYNC ALM RX ALM ( )
HIGH BER ALM RX ALM ( )
LOW BER ALM RX ALM ( )
BER ALM RX ALM ( )
TX ALM ( )
OPR ALM
RX ALM ( )
TX PWR ALM TX ALM ( )
RX LEV ALM RX ALM ( )
TX ALM ( )
APC 1 ALM
RX ALM ( )
TX ALM ( )
APC 2 ALM
RX ALM ( )
IF INPUT ALM TX ALM ( )
MAINT ALM MAINT
— MAINT ( )
MAINT ALM MAINT ( )
REMOTE ALARM
REPORT *1
—
—
TX ALM ( )
TX ALM ( )
RX ALM ( )
RX ALM ( )
IDU
TX ALM ( )
TX ALM 1/2
RX ALM 1/2
LAN INTFC ALM
TX ALM ( )
TX ALM ( )
RX ALM ( )
RX ALM ( )
TX ALM ( )
TX ALM ( )
RX ALM ( )
RX ALM ( )
RX ALM ( )
IDU
RX ALM, ( ) BER ALM
RX ALM ( ), BER ALM
RX ALM ( ), BER ALM
TX ALM( )
RX ALM ( )
TX ALM ( )
RX ALM ( )
TX ALM ( )
ODU RX ALM ( )
TX ALM ( )
RX ALM ( )
TX ALM ( )
MAINT ALM
—
MAINT ALM