Hi, I have a CRS/32 running Cisco IOS XR Software, Version 3.8.1, I was told there is a limitation on how many ITU (dwdm) 10G Xenpaks you can use in the 10-Gigabit Ethernet PLIM. I currently have four Xenpaks installed in one card, one of them is a dwdm Xenpak. Because of that I was told I cannot add a 5th Xenpak due to heat dissapation issues, is that true? Oversubscription is not an issue currently.
Hi, Yes, that's correct, you can only have four of them.
please take a look:
"the 10-GE PLIM supports from one to four pluggable dense wavelength-division multiplexing (DWDM) XENPAK optics modules, each providing full-duplex long-wavelength DWDM optics with SC fiber-optic interfaces. See the "8-Port 10-Gigabit Ethernet PLIM" section for general information regarding the PLIM.
When using DWDM optics modules on your 10-GE PLIM, an empty slot must exist next to each installed DWDM module to provide optimal cooling for the DWDM optics. For this reason, you can install up to four DWDM XENPAK modules in the 10-GE PLIM. Given this restriction and to optimize the PLIM for oversubscription, you should use port positions 0, 2, 5, and 7.