How To Check Lyr Led; Repair Procedure When Led Indicates Abnormality; Figure 6-2 Led Indications On Fusion Link Related Circuit Cards - NEC NEAX 2400 IPX Manual

POST INSTALLATION TEST

Repair Procedure When LED Indicates Abnormality

1.1 How to check LYR LED

1. Confirm the LYR LED lights green on the front edge of the FCH (PA-FCHA) circuit card. (See "LED
Indication (A)" in
2. Make sure that any alarm LED is not ON (red/yellow). (See LED Indication (B) in
When all alarm LEDs are OFF, the DTI (PA-24DTR) card is in normal operation.
If any abnormal state is detected, please see the NEAX2400 IPX Circuit Card Manual.
LED Indication (A)
Remains ON
LYR
when Fusion Link
is established
Remains ON LB
when available
for Ethernet
LOAD
Remains ON
when ready to broadcast
data packets
Note
Note: When the FCH is a Root Bridge, the LOAD LED remains ON.
When the FCH is Backup Bridge, the LOAD LED flashes (60INT).

Figure 6-2 LED Indications on Fusion Link Related Circuit Cards

2. Repair Procedure When LED Indicates Abnormality
If the LED indication appears abnormal, check the following items again:
CHAPTER 6
Page 146
Revision 1.0
Figure 6-2.) When the LED lights green, the fusion link is established.
Send
EST3
Receive Polarity of
EST2
pairwire is normal
EST1 Receive
EST0 Link is
established
NDA-24299
DTI
FCH
PA-24DTR
PA-FCHA
OPE
PCM
LYR
EST3
LB EST2
BER
EST1
LOAD
AIS
EST0
Payload
Line
Internal
ON
8 Mode
DTI
Front Cable
FCH
FRONT
Figure 6-2.)
OPE
FRM
RMT
LED Indication (B)
If any LED is ON, refer to the "Circuit
Card Manual."
PCM : On when PCM loss occurs.
FRM : On when Frame Loss occurs.
BER : On when Bit Error occurs.
RMT : On when Remote Alarm is received.
AIS : On when AIS signal is detected.