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The Cisco NS-SI-622-L2 is a transceiver module from Cisco. Cisco offer a large range of transceivers to help broaden your network connectivity.
Cisco NS-SI-622-L2: SFP - OC12/STM4 LR, L-4.2, 1550 nm, ITEMP.
Cisco 15454-CE-1000-4 ONS 15454 4x 1GB Port Carrier Edge Card
Cisco 15454-40-SMR1-C ONS 15454 40Chs Module ROADM w/ Optical PRE Amplifier