BCM FEM 6Port Fiber Expansion Media Bay Module:

BCM Fiber Expansion Media Bay Module provides 6 port of expansion that can be used in conjunction with the Norstar Expansion Modules including: 0x16 fiber expansion, 12x0 fiber trunk module, 0x8 asm module, LS/DS and CLID trunk Cards. The FEM card is a single density card. For the BCM 50, 200, 400 and 450.

The Nortel BCM FEM is compatible with the BCM 200/400 Main Unit, BCM 400 Expansion Unit, BCM 450 Main Unit, BCM 450 Expansion Unit and BCM 50 Expansion Unit