I ran into an interesting oversight on my part today. We have a cluster of Avaya Ethernet Routing Switch 8600s which are running dual 8692SFs w/Mezz and a combination E and R cards on 5.1.3.1 software. We’re growing the network (when are we not) and we’ve outgrown the two 8630GBRs we have in each switch. So we purchased a 8648GBRS for each switch along with an 8648GTRS to replace the legacy 8648TXE card.

Upon inserting the 8648GBRS module in slot 9 we received the following alarm from the console;

CPU5 [10/18/11 12:48:29] SNMP INFO Chassis running on low fan cooling.Please change the fan. Note that if the switch is booted with fan check enabled, then to power up,
1. R module requires a fan (regular or high speed) in running state.
2. RS module requires a high speed fan in running state.
CPU5 [10/18/11 12:48:29] HW ERROR Card in Slot=9, Type=8648GBRS, not powered on due to fan requirements.
CPU5 [10/18/11 12:48:48] HW INFO Card removed: Slot=9 Type=8648GBRS

I immediately knew what the problem was, I had overlooked the high-speed fan tray requirement for any RS modules. We have legacy chassis’s at this location so I knew that slots 1 and 10 couldn’t be populated by an R/RS module, I also knew the power supplies had already been upgraded to 8005PS’s so there was adequate power. However, I overlooked the cooling requirement so today I had to order a bunch of 8010CMHS fan trays.

Cheers!