I have had to swap about 15 of these dam M20 PSU's because of the "fan fail
alarm". Its seems to be a problem with the earlier hardware revisions.
I wouldn't worry too much as I dont think the PSU is actually dead ... if
you do a "show chassis environment" you will probably see the temperature is
normal. Its more an pain to have to deal with the traps and syslogs.
Just be sure to get a maintenance window to do these swaps ... I have has a
few bad experiences with the routers rebooting for no good reason when doing
this "hot-swap".
Ryan
-----Original Message-----
From: Daniel Puka [mailto:daniel.puka@gvt.net.br]
Sent: Wednesday, July 24, 2002 1:18 PM
To: juniper-nsp@puck.nether.net
Subject: M20 DC Power Supply Fail
Hello All,
We have 3 M20's with redundant DC power supply's.
One month ago we started to have major power supply fan alarm's in B
power supply. The failed power supply was replaced at both routers and after
a week the A power supply started to show the same alarm in both routers.
The equipment is installed in a controlled enviroment with stable
power(DC) and air conditioner.
Anybody else had some similar problem with Juniper Power Supply?
Daniel
Manager@jnpr-cta-re0> show chassis hardware
Hardware inventory:
Item Version Part number Serial number Description
Chassis 24819 M20
Backplane REV 08 710-001517 AW4750
Power Supply A REV 06 740-001466 002368 DC
Power Supply B REV 04 740-001466 000843 DC
Display REV 04 710-001519 AS2850
Host 0 bb000007346fd001 teknor
Host 1 REV 08 740-003239 1000325882 Teknor
SSB slot 0 REV 01 710-001951 BD2162 Internet Processor
II
SSB slot 1 N/A N/A N/A backup
FPC 0 REV 01 710-001292 AR7808
PIC 0 REV 04 750-000610 AL8872 2x OC-3 ATM, SMIR
PIC 1 REV 08 750-002303 AP0974 4x F/E, 100 BASE-TX
PIC 3 REV 02 750-002629 AM7940 4x E1, BNC
FPC 1 REV 01 710-001292 AN0137
PIC 0 REV 04 750-000610 AR6312 2x OC-3 ATM, SMIR
PIC 1 REV 07 750-002303 AN2268 4x F/E, 100 BASE-TX
PIC 3 REV 02 750-002629 AM7921 4x E1, BNC
Manager@jnpr-cta-re0> show chassis alarms
1 alarms currently active
Alarm time Class Description
2002-07-16 14:50:07 BRT Major Power Supply A fan failed
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