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Cisco Digital Gateway DT-24+

DT-24+ or DE-30+ Module Installation and Configuration Note


Table of Contents

DT-24+ or DE-30+ Module Installation and Configuration Note

DT-24+ or DE-30+ Module Installation and Configuration Note


The following sections describe how to use this manual.

Purpose and Scope

This note describes how to install, configure and use the DT-24+ or DE-30+ printed circuit board module. To properly use this note, you should be familiar with electronic devices.

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Related Documentation

The DT-24+ or DE-30+ module is a hardware interface that is used with Cisco CallManager software. For additional information, such as the latest release or configuration notes, use the instructions in "Documentation Notes" section to access the related documents in Cisco Connection Online. Direct access to the documentation on the World Wide Web is at http://www.cisco.com/univercd/cc/td/doc/product/voice/index.htm and http://www.selsius.com/documentation/v22/index.htm

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Cautions use the following conventions:

Caution Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data.

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Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, you must be aware of the hazards involved with electrical circuitry and familiar with standard practices for preventing accidents.

Abbreviations and Terminology

Each abbreviation, unless widely used, is spelled out in full immediately prior to its first use.

Industry standard terms only are used throughout this manual.


The DT-24+ or DE-30+ modules are hardware devices that are used with Cisco CallManager to interface Cisco IP phones to the Internet. The DT-24+ or DE-30+ module is installed in a Personal Computer (PC) Server.

FCC Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at the user's expense.


The following sections describe the installation procedures for the DT-24+ or DE-30+ module.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage occurs when electronic cards or components are improperly handled and can result in complete or intermittent failures. Follow these guidelines to prevent ESD damage:

  • Always use an ESD-preventive wrist or ankle strap.

    • Ensure that the strap is connected to a known grounded source and that it makes good skin contact.

Caution Periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohms (Mohms).
  • Handle cards by the edges only.

Avoid contact between the modules and clothing. The wrist strap protects only the card from ESD voltages on the body; ESD voltages on clothing can still cause damage.

Safety Information

Warning Only trained and qualified personnel should be allowed to install or replace this equipment.
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages.
Warning The telecommunications lines must be disconnected 1) before unplugging the main power connector and/or 2) while the housing is open.
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals.
Warning Before working on a system that has a standby or off switch, turn off the power by pressing the switch and unplug the power cord(s).
Warning The port labeled "Ethernet" is a safety extra-low voltage (SELV) circuit. SELV circuits should only be connected to other SELV circuits. Because the T1/E1 circuits are treated like telephone-network voltage, avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits.
Warning During this procedure, wear grounding wrist straps to avoid ESD damage to the card. Do not directly touch the backplane with your hand or any metal tool, or you could shock yourself.
Warning The DE-30+ must be used with an IEC60950/EN60950 approved CSU/DSU.
Warning This equipment is to be installed and maintained by service personnel only as defined by AS/NZS 3260 Clause Service Personnel.
Warning The E1 interface card may only be installed in an ACA-permitted customer equipment or a Data Terminal Equipment (DTE) that is exempted from ACA's permit requirements. The customer equipment must only be housed in a cabinet that has screw-down lids to stop user access to overvoltages on the customer equipment. The customer equipment has circuitry that may have telecommunications network voltages on them.
Warning To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord.
Warning The safety cover is an integral part of the product. Do not operate the unit without the safety cover installed. Operating the unit without the cover in place will invalidate the safety approvals and pose a risk of fire and electrical hazards.
Caution Electronic components on printed circuit boards are extremely sensitive to static electricity. Normal amounts of static electricity generated by clothing can damage electronic equipment. To reduce the risk of damage due to electrostatic discharge, it is recommended when installing electronic equipment, that anti-static grounding straps and mats are used.

PC Server Requirements

The DT-24+ or DE-30+ module is installed in a 32-bit Personal Computer Interface (PCI) slot in a PC desktop or server chassis. The DT-24+ or DE-30+ module only requires power and reset signal from the PC chassis.

Note The DT-24+ or DE-30+ modules do not require configuration of printed circuit components such as switches or jumpers.

Installation Instructions

Use the manufacturer's installation instructions and the following steps to install the DT-24+ or DE-30+ module in a PCI slot in a PC server chassis.

Note This module is intended to be installed in UL Listed equipment in the field. It shall be installed only in the equipment manufacturer's defined operator accessible area. Check with the equipment manufacturer to verify or confirm that your equipment is suitable for user-installed application modules.

Step 1 End all applications running on the PC and turn the power switch off.

Step 2 Remove the power cord from the PC. If the PC has more than one power cord, remove all of the power cords.

Step 3 Remove the PC chassis cover.

Step 4 Choose an available PCI slot and remove its blank rear bracket. Save the mounting screw for Step 7.

Step 5 Locate the supplied PCI retainer and 2 screws. Secure the retainer to the edge of the DT-24+ or the DE-30+ module.

Step 6 Insert the DT-24+ or DE-30+ module into the chosen PCI slot. Ensure that the rear bracket of the DT-24+ or DE-30+ module fits correctly into the opening in the rear panel of the PC's chassis. Check to see if the edge of the PCI retainer was inserted properly into the PCI slot.

Step 7 Secure the rear bracket of the DT-24+ or DE-30+ module into the chassis frame with the screw that was removed in Step 4. This will also ensure chassis ground to the DT-24+ or DE-30+ module.

Step 8 Replace and secure the PC's cover.

Step 9 Select the appropriate network interface cable for connecting to the DT-24+ or DE-30+ module.

  • For the DE-30+ module, the connector is marked T1 for a T1 cable.

  • For the DT-24+ module, the connector is marked E1 for the E1 cable.

  • Use the Ethernet connector, on either module, for the Ethernet cable.

Step 10 Return power to the PC.

Step 11 Restart the applications.

Step 12 Follow the instructions in the Cisco CallManager application for any software configuration of the module.


There are four LEDs on the face plate and four LEDs on the component side of the printed circuit board. See Table 1 for a description of the LEDs on the face plate and Table 2 for a description of the LEDs on the printed circuit board.

Table 1: Face Plate LED Descriptions
LED Color Description



Collision detected on the T1 interface



T1 link detect

Part of the Ethernet RJ 45 connector


Received packets on the Ethernet interface

Part of the Ethernet RJ 45 connector


Link detected on the Ethernet interface

Table 2: Printed Circuit Board LED Descriptions
LED Color Description



Flashing light indicates normal operation. If the light is not flashing, try resetting the unit.



This LED is load dependent and is used mainly for Cisco internal diagnostics.



Indicates D-Channel activity:

  • On, with occasional blinking off, indicates D-channel is functioning properly.

  • Off, with occasionally blinking on, indicates the D-channel is not functioning properly. Check PRI connections and verify that the same protocols are used from the CO/LEC/PBX to the module.

Note Blinking indicates either transmit or receive activity.



On indicates the gateway has registered with the CallManager.

Off indicates the module has not registered with the CallManager. To troubleshoot this condition:

  • Check CallManager Administration to be sure the information for this module is correct.

  • Verify the module has a DHCP lease (Option 150 or 66 configured, or Cisco BootP utility is in use).

  • Verify CallManager and TFTP are running.

DT-24+ or DE-30+ Module Specifications

Table 3 lists the safety, compliance, and telecom approvals and Table 4 describes the specifications for the DT-24+ or DE-30+ module.

Table 3: Safety, Compliance, and Telecom Approvals
Safety Approvals

UL1950, CSA 22.2, No. 950



Regulatory Compliance

E1 (DE-30+)

CE Marking

EN55022 Class A

CISPR 22 Class A and AS/NZS3548 Class A with UTP1 cables

CISPR 22 Class B with FTP2 cables

T1 (DT-24+)

FCC Part 15 (47CFR) Class A

CISPR 22 Class A with UTP cables


E1 (DE-30+)

Europe: CTR4

Australia: TS038, TS014

T1 (DT-24+)

FCC Part 68

Registration number: 5B1USA-33654-DD-N, Connector RJ48C,

Canada: CS03

Certification number: 2461 9716A

1Unshielded Twisted Pair
2Foil Twisted Pair

Table 4: Specifications
Feature Specification

Voice Compression and


G.723.1 5.3/6.3 kbps - 32 channels

G.729 - 32 channels

G.711 PCM @ 64 kbps - 32 channels

G.726/7 ADPCM - 32 channels

NetCoder ® - 32 channels

Silence Suppression

G.729 Annex B

G.723.1 Annex A

Echo Cancellation

G.165, 16msec Echo Cancellation

Real-Time Fax Relay

Group 3 fax relay up to 14400 bps with auto

fallback, Fax/Modem bypass mode

VoIP IA Compliance

Voice Transfer: per VoIP IA 1.0

RTP and RTCP per RFC 1889/1890

Dialed Digits

Detection and Generation per TIA 464A; DTMF

PCI Interface

32-bit PCI bus @ 33 MHz, Rev. 2.1, slave

On-card TDM Interfacess

SCSA bus, 512 full-duplex channels, or

MVIP bus, 256 full-duplex channels


10 BaseT IEEE 802.3

Control Microprocessor

Motorola MPC860 PowerQUICC

Digital Signaling Processors

Eight AC4804A-C QuadVoIP Processors

Maximum Power Consumption

1.7 W @ 5.0 V


Ethernet - RJ-45 Shielded


Full size PCI (12.3 inch long)

Operating System

Windows NT 4.0

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