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1-port G.SHDSL WAN interface card
1-Port ISDN WAN Interface Card (dial and leased line)
One ISDN BRI port (S/T interface, requires external NT-1)
One-port Analog Modem Interface card
2-Port 2nd Gen Multiflex Trunk Voice/WAN Int. Card - G.703
1-Port 2nd Gen Multiflex Trunk Voice/WAN Int. Card - G.703
2-Port RJ-48 Multiflex Trunk - E1/T1
2-Port RJ-48 Multiflex Trunk-E1 G.703
1-Port RJ-48 Multiflex Trunk-E1 G.703
Two-port ISDN BRI VIC, S/T interface, Terminal Equipment (TE)
Two-port ISDN BRI VIC, S/T interface, Network Termination (NT) or TE
PVDM2 16-channel to 64-channel factory upgrade
Cisco 16-Channel Packet Voice/Fax DSP Module
One 23-port 10/100 Cisco EtherSwitch service module, 1 10/100/1000 port and IP Base
Cisco Intrusion Prevention System Network Module Enhanced for Cisco 2811/2821/2851/3800 Series
Cisco Wireless LAN Controller Module for managing up to 6 lightweight access points
Standard single-wide Cisco EtherSwitch service module with 16 10/100-Mbps ports with Power over Ethernet (PoE), and 1 10/100/1000 Gigabit Ethernet port
Single-Port 12 Channel E1 Voice/Fax Network Module
2-slot IP communications enhanced voice/fax network module