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The Cisco SPA-8XOC3-POS is Shared Port Adapter from Cisco. An SPA is a modular port adapter that inserts into a subslot of a compatible SIP carrier card.
Cisco SPA-8XOC3-POS: 8x OC3/STM-1 POS.
NEW Cisco SPA-10X1GE-V2 10x 1GB SFP Shared Port Adapter
Cisco SPA-2XT3/E3-V2 T3/E3 Shared V2 2x Clear Channel Router Port Adapter