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The Linksys SPA3102 includes 2 100BaseT RJ-45 Ethernet interfaces to connect to a home or office LAN, as well as an Ethernet connection to a broadband modem or router. The Linksys SPA3102 FXS and FXO lines can be independently configured via software controlled by the VoIP service provider or the end user.
Check out these other Cisco Analog Telephone Adapters:
Q: where can i find a user guide for linksys spa31023
A: Since the SPA3102 is EOL, it is tough to find.
Here is the quick start guide for the SPA3102: http://www.cisco.com/en/US/docs/voice_ip_comm/csbpvga/spa3102/quick_start/guide/spa3102_quick.pdf
Here is a full User Guide for the PAP2T which is very similar to the SPA3102 and you may find it helpful:
Q: SPA3102 is remplaced by SPA122. But SPA3102 have 1 FXO and 1 FXS, and SPA122 have 2 FXS and no FXO. Is it possible to connect SPA122 to an old POTS line ?
A: If you will need an FXO and FXS port I would suggest checking out the Grandstream HT503.