... /T-1 - refurbished - for Cisco 17XX, 26XX, 2811 2-pair, 28XX, 28XX 4-pair, 28XX V3PN, 3631, 37XX, 38XX, 38XX V3PNDevice TypeExpansion moduleForm ... , 2650, 2651, 2691, 2801, 2801 4-pair, 2801 V3PN, 2811, 2811 2-pair, 2811 4-pair, 2811 V3PN, 2821, 2821 4-pair, 2821 V3PN, 2851, 2851 V3PN ...