Cisco DT-24+/DE-30+
The DT-24/DE-30+ is a PCI-based digital gateway card that supports up to 23
or 30 voice channels.The card can be installed in a Cisco CallManager server or
any other PC with PCI slots, and only draws power from the PC.The DT-24/
DE-30+ card provides connectivity to the PSTN or a PBX.The DT-24/DE-30
www.syngress.com
Figure 3.1 Cisco 7200
PSTN
PBX
Cisco
CallManager
IP Phone
IP Phone
Cisco 7200
H.323 Gateway
Switch
84 Chapter 3 • AVVID Gateway Selection
communicates with Cisco CallManager via Skinny Station Protocol and supports
supplementary services such as hold, transfer, and call forwarding.The DT-24/
DE-30 features ISDN PRI (T1/E1) rates for its trunk interface and a 10Base-T
Ethernet port for the IP network. If more trunks are needed, you can install as
many of the DT-24 or DE-30 cards that any given PC with PCI slots will support.
These cards provide similar functionality as the NM-HDV-1T1-24 or NMHDV-
1E1-30 modules for the Cisco 2600 and 3600 Series routers. If your company
has not invested in a router such as a 2600 or 3600 and has available PCs
with PCI slots, the DT-24 could be utilized to provide ISDN PRI connectivity. I
foresee the majority of development in further software and hardware enhancements
in the router and switch class gateways.This will allow enterprises to
leverage their current investment and knowledge in these platforms.