Product UPC: 098377271598 Cisco High-Speed - Expansion module - RS-232 x 16 - for Cisco 1841 ADSL2, 18XX, 1921 4-pair, 1921 ADSL2+, 1921 T1, 19XX, 28XX, 29XX, 38XX, 39XX
30 Day Warranty Included. Extended warranty is available. Contact your sales rep for more information.