This is a CiscoPA-A3-OC12SMIOC-12c/STM-4 single-mode intermediate reach.
PA-A3-OC12SMI is a dual-width ATM port adapter that provides a single-port, 622.08 Mbps connection from Cisco7500 series routers to any ATM switch.

The PA-A3 OC-12 supports the following features:

•Up to 4096 total virtual connections (open VCs)

•Up to 2000 simultaneous segmentations and reassemblies (SARs)

•ATM adaptation layer 5 (AAL5) for data traffic

•Physical interface: SONET/SDH optical fiber (OC-12c or STM-4c)

•Traffic shaping on a per-VC basis

•Non-real-time variable bit rate (nrt-VBR) and unspecified bit rate (UBR) quality of service (QoS)

•Operation, Administration, and Maintenance alarm indication signal (OAM AIS) cells

•Online insertion and removal (OIR)

The PA-A3 OC-12 supports the following protocols, services, and ATM-specific software:

•User-Network Interface (UNI) signaling

•Integrated Local Management Interface (ILMI)

•RFC 1483

•RFC stock Tested Working with a 90 day warranty
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Here is a link to Cisco's Website for more info:[link removed by ]