The Cisco DT-24+ digital gateway provides a connection path between the Cisco AVVID (Architecture for Voice, Video and Integrated Data) packet telephony network and the Public Switched Telephone Network (PSTN) or a PBX using digital (PRI ISDN) trunks. The DT-24+ supports 23 voice channels on a T1 interface. Gateways are managed, controlled, and administered through the required Cisco CallManager. The DT-24+ gateway consists of a single PCI bus-based card and mounts in any PCI bus PC (where it only draws power).
The digital gateways include the following features:
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A single PCI-based card (PCI bus for power only) with the following components on board:
Integrated digital signal processors (DSPs)
T1 (RJ-48C female) interface
10Base-T Ethernet network interface (RJ-45 female)
Control processor with communications software to connect to the Cisco CallManager (required) over TCP/IP/Ethernet link
Remote boot procedure with DHCP (for IP address) and TFTP software download (downloadable and upgradable)
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T1 PRI ISDN Layer 3 protocols, including National ISDN-2 (NI-2), 5 Electronic Switching System (5ESS), 5ESS custom, DMS100, DMS250, and other protocol support
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Both user-side and network-side ISDN signaling support to emulate either terminal equipment or switching equipment, respectively
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Supports Skinny Gateway protocol communications with Cisco CallManager to provide supplementary services (hold, transfer, etc.) under control of IP telephone clients
The Cisco access model DT-24+ (T1) allows customers to connect the Cisco AVVID packet telephony network to the PSTN or to a PBX. The physical circuit-switched interface is a single female RJ-48C interface. The circuit-switched signaling interface is T1 PRI ISDN. The DT-24+ gateway supports up to 23 simultaneous channels of voice over IP (VoIP) packet to circuit-switched adaption, G.711 encoding (A-law or m-law), dual tone multifrequency (DTMF) detection/generation, signaling, and line echo cancellation. A full 23 simultaneous channels of G.723.1 encode/decode are also supported.
The DT-24+ has been successfully connected to a wide variety of PBXs including:
The DT-24+ has also been connected to many public switches including:
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Lucent 4ESS and 5ESS
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Nortel SL1, SL100, DMS-100, and DMS-250
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DSC (Digital Switch DSC600E using T1 PRI)
The Cisco AVVID telephony solution provides a full-featured telephony system running on an IP network. Various IP telephony devices including phones and gateways communicate seamlessly over IP infrastructures under the control of one or more Cisco CallManagers. This solution rewards users with greatly reduced cost of ownership and new IP-based feature capabilities. The DT-24+ digital gateways provide the ability to make and receive calls outside the IP network. These gateways provide the interface to the PSTN or existing PBX systems via ISDN PRI interfaces. They differ from the analog gateway products in that they support digital ISDN features including direct inward dial (DID, often called DDI) and caller ID. These features allow outside callers to dial directly to a particular user without going through an attendant (operator). In addition, digital interfaces usually provide a more economical interface choice when the number of trunks exceeds six to eight channels.
When deployed in a network, the DT-24+ Digital Gateways can be located in any convenient PCI bus-based PC. They simply draw power from the host PC and are completely managed via browser access through the Cisco CallManager. Because they only draw power, they do not affect the performance or operation of the host PC, nor do they require any special software or drivers. They may even be installed in the Cisco CallManager itself.
When more than one DT-24+ gateway is needed, it can be treated as a separate gateway or aggregated together with others as a common pool of channels. Any number of digital gateways can be installed in a network, and the number installed in a PC is only limited by the number of available slots.
The DT-24+ communicates with the Cisco CallManager, which allows the implementation of supplementary services such as hold, transfer, and forward on outside calls. Also, with proxy signaling provided by the Cisco CallManager, the DT-24+ is fully H.323 V.2 compatible.
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Simple PCI bus installation
Installs in any PCI bus-based PC. The card only draws power, so no drivers or software need to be installed
Does not interfere with the performance or operation of the host PC
Can be mounted in the Cisco CallManager PC or any other convenient PC
For high-density applications, simply install more cards in the same PC up to the max number of slots
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PRI ISDN (T1 rate) trunk interface through female RJ-48C interface
Both user-side and network-side Q.931 signaling (software selectable)
Support for National ISDN-II (NI-2), DMS, and 5ESS variants
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Adds convenient call features to the IP telephony system
Caller ID (name and number, inbound and outbound)
Direct inward dialing
Supplementary services for outside calls (hold, transfer, forward, conference) under control of the Cisco CallManager
Per port management and backhaul of the signaling channel to the Cisco CallManager for complete control
Follows Cisco CallManager failover scenario-when Cisco CallManager switches to backup, the card registers with the new Cisco CallManager
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Standard management features
Completely manageable from the browser-based Cisco CallManager
Ethernet device status LEDs (Ethernet link, Ethernet transmit/receive)
Trunk status LEDs
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Network/application aware
H.323 compatible when used with Cisco CallManager
DHCP client-for IP address acquisition
Locates Cisco CallManager via DHCP or DNS
Automatic TFTP software and configuration download upon boot up if necessary
Automatic registration with Cisco CallManager
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Framing format: D4 Superframe (SF) and Extended Superframe (ESF)
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Input level: +1 dBo to -24 dBmo
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Output level: 0, -7.5, or -15 dB
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Diagnostic loopback support
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Hardware
