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Cisco High-Speed - Expansion module

• HWIC
• RS-232, RS-530, X.21, V.35, RS-449, RS-530A
• 2 ports
• for Cisco 1841, 1841 ADSL2, 1921 4-pair, 1921 ADSL2+, 1921 T1, 19XX, 28XX, 29XX, 38XX, 39XX