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GL-2
Cisco 10000 Series Router SIP and SPA Hardware Installation Guide
OL-13838-03
SPA
Shared port adapter. A SPA is a modular, platform-independent port adapter that inserts into a subslot
of a compatible SIP carrier card to provide network connectivity and increased interface port density.
The SPA provides the interface between the network and the SIP.
subslot
Secondary slot on a SIP where a SPA is installed. The primary slot is the chassis slot on the router.