Cisco HWIC-4T= High-Speed - Expansion module - HDLC, RS-232, PPP, RS-530, X.21, V.35, RS-449, SLIP, RS-530A - 4 ports - for Cisco 28XX, 28XX 2-pair, 28XX 4-pair, 28XX V3PN, 29XX, 38XX, 38XX V3PN, 39XX Product Type:HWIC Brand Name:Cisco Manufacturer:Cisco Systems, Inc Product Name:4-Port Serial High-Speed WAN Interface Card Manufacturer Part Number:HWIC-4T=