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Comrex DH30 Product Manual

Digital telephone hybrid
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Summary of Contents for Comrex DH30

  • Page 1: Table Of Contents

    1 ..i ..................4 ection ntroduction ......W ? ..............4 hat iS a ybrid ......dh30 F ................ 4 eatureS ......W dh30? ............ 6 omeS With the ......P ......6 roduct egiStration and echnical uPPort ......o ............7 Perational equirementS 2..c ..............
  • Page 2 ......S ................32 onnector ......xlr c ................. 32 onnector 8..S ............. 33 ection erial ommunicationS rotocol 9..dh30 a ................35 udio ection 10..c ................... 36 omPliance ection ......Fcc P 15 c ............36 omPliance ......Fcc P 68 c ............

  • Page 3: Copyright Notice

    Most items are available off-the-shelf, either directly from Comrex or from our stocking dealers. Comrex stands behind its products. We promise that if you call us for technical assistance, you will talk directly with someone who knows about the equipment and will do everything possible to help you.

  • Page 4: Ntroduction

    F The DH30 provides a high quality telephone interface between a tele- eatureS phone line and audio equipment to help bring uniformity and high quality sound to a broadcast talk show environment.
  • Page 5 • The DH30 presets are the programmable operating parameters that control how the DH30 responds to the telephone line. The DH30 can store up to three presets. The unit ships with Preset 1 containing a set of default values.

  • Page 6: Hat Omes With The

    Digital Telephone Hybrid Product Manual AC Power Cord Telephone Cable DH30 Installation and Operations Manual Please register your DH30 by filling out and returning the enclosed warranty roduct egiStration and registration card or by visiting our website www.comrex.com/warranty.html. echnical uPPort When your DH30 is properly registered, Comrex can better serve you should you require technical assistance, need upgrades or new product information.

  • Page 7: Equirements

    These areas increase the amount of audio reverberation in the room which, in turn, reduces audio quality. To achieve the best results using the DH30, you should minimize the amount of audio reverberation wherever possible. You can improve room acoustics by installing acoustic panels, drapes and other wall fabrics.

  • Page 8: Onnecting The Quipment

    All equipment connections are made through the back panel. Position the DH30 so that the connectors are readily accessible and their pin orientation is visible. To use the functions associated with these connections, refer to “Setup and Operation,” beginning on page 12.

  • Page 9: Ypical Dh30 D

    S connector. If you are using a microphone connected directly to the DH30 that requires phantom power, you will need to acti- vate the phantom power circuit. Contact Comrex technical support. Cue In — This is the audio the caller will hear when the cue feature, located on the front panel, is activated.

  • Page 10: Onnections

    LINE SET do not provide battery voltage (dry line, no DC offset voltage). If your line does not, the DH30 may be configured by qualified personnel for dry line operation. Please contact Comrex technical support for details. Line — Plug your telephone line into the rJ11C l jack.
  • Page 11 DH30 Product Manual RS232 Serial Port — This DB9 female connector connects to the serial RS232 port of a PC or other RS232 device. The serial port settings are fixed at 9600 baud, 8-bit, no parity, 1 stop bit. This port receives commands to re- motely control operation, request status or download firmware upgrades.

  • Page 12: Etup And Peration

    Caller Send Volume Enter On and Off — When the DH30 is plugged in, it defaults with the hybrid off, indicated by the red O LED. The O button connects the DH30 to the telephone line and causes the hybrid to adapt to the line.
  • Page 13 DH30 Product Manual VU Meters (Send and Caller) — These LED’s indicate the audio levels at Send the S and C XLR connectors. AllEr The S meter indicates the level of the audio sent to the caller. The input Caller gain should be set so that the average send level is at 0 dBU with occasional peaks to +4 dBU.

  • Page 14: Andling C Alls

    Comrex Corporation Receiving a Call — To set up the DH30 for automatic answer or discon- andling allS nect, refer to “System Parameters” (pages 25–26). • On-Air — When a call rings on the telephone line connected to the DH30, the O...

  • Page 15: Ecording Alls

    The A connector ECOrd OntrOl of the DH30 must also be connected to the recording device. The record function has three settings: off, record-ready (standby) and on (recording). Pressing the r button has different effects, depending ECOrd on whether the DH30 is on or off.

  • Page 16: Sing The N Avigating

    Comrex Corporation Send Caller Volume Enter 2 GAIN SEND IN LCD Panel To scroll through the menu items on the LCD panel, press the U and d Sing the avigating buttons. When a desired menu item is reached, press E .

  • Page 17: Anel

    Adjust Audio for Incoming Calls 3 Band EQ Adjusts to tonal quality of the caller's voice Bypass Compressor Enables DH30 to handle wide range of caller voice levels Bypass Expander Attenuates line or background noise when caller is not talking Bypass...

  • Page 18: Etting Evels

    Comrex Corporation The DH30 allows the pre-configuration of up to three complete usage pro- Sing reSetS files through the Presets menu. Preset 1 First, select the preset (Preset 1, Preset 2, or Preset 3). Within the Preset menu you can copy preset values into one of the other two presets, you...

  • Page 19: E Cho C Ancellation

    Echo Canceller menu in the LCD panel. Although the DSP automatically adjusts to cancel echo, it is recommended you train the echo canceller to the echo when you first install the DH30. See “EC Train” on page 20.

  • Page 20: Ec T

    The display shows both the Echo Return Loss (ERL) and the current Echo Cancellation (EC). 1. Place a call and route it through the DH30, or have someone call in. If echo is present, continue with steps 2–7. 2. Select EC Train from the Echo Canceller menu and press E...

  • Page 21: Iagnostics

    Pressing Esc will take you out of the diagnostic, but will not stop the test signal. When configuring your DH30, you can send a test signal through the moni- ignal tor (Receive), through the telephone line (Transmit) or through both.

  • Page 22: Ustomizing Our Ystem

    Compressor — The function of the compressor is to keep the caller output at the same level regardless of the incoming level. The caller level should be set to accommodate the quiet callers. The DH30 compresses, or attenuates, the louder levels.
  • Page 23 (no expansion). When the caller audio sample drops below the expander threshold, the expander function decreases the gain by the ratio deter- mined at setup. Note: If the expander threshold is set too high, the DH30 may treat the caller as noise. This results in downward expansion of caller audio.
  • Page 24 The trade-off in setting noise burst on is that the caller hears a momentary noise burst, but the telephone audio is immediately adapted. Setting the noise burst off spares the caller the brief noise, but the DH30 may require 5 to 20 seconds to adapt.

  • Page 25: Ystem Arameters

    Only or Loop Drop+CP . 3. Press E to exit the function. Remote Control — DH30 on and off functions can be remotely controlled by momentary or latching switches. To change the setting, select Remote Control from the system menu and press E .
  • Page 26 Comrex Corporation Momentary If you prefer to use a momentary switch to remotely control the DH30, se- lect Momentary in the Remote Control menu. Pins 1 and 2 when shorted to ground, will remotely turn the DH30 on and off respectively. Note: The and c functions can only be activated by momentary closures.
  • Page 27 If an AES/EBU input is applied (and the correct sampling rate option is cho- sen), the AES/EBU output will synchronize to the input sampling rate clock. Set Passcode — The DH30 passcode can be user programmed. The default passcode is E ntEr 1.

  • Page 28: Pecifications

    Comrex Corporation eCtion peCifiCations 17.125”/43.5cm W x 1.75”/4.44cm H x 10.125”/25.7cm D imenSionS Rackmount included for installation in a 19” rack 6.7lbs/3.04kg (dry)11.2lbs/5.08kg (shipping) eight 32-100°F/0-38°C Perating emPerature 0-80% - Humidity LCD programming display, E / programming buttons, moni- ront...

  • Page 29: Elephone Ransmit

    DH30 Product Manual Status Outputs: Remotely check the status of the hybrid with the ON, OFF, CUE, REC, send presence and caller presence status outputs. All status outputs are open collector outputs rated at 40VDC and 50mA maximum. MONITOR OUTPUT: 1/4” stereo jack...

  • Page 30: Elephone Eceive

    Comrex Corporation All measurements referenced at –15 dBm level on the phone line with elePhone eceive caller processing options bypassed. FREQUENCY RESPONSE: +/- 1dB from 250Hz to 3.5kHz DYNAMIC RANGE: >70dB DISTORTION: <0.1% TAIL TIME: 120 milliseconds ancellation NULL: 50dB...
  • Page 31 DH30 Product Manual eCtion inouts Description Description emote onnector Remote on * Remote on Indication ** Remote off * Remote off Indication ** Remote Record * Record Indication ** Remote Cue * Cue Indication ** Switch/Indicator Common Indicator Common †...
  • Page 32 S jacks. This connection is useful for key telephone system such as the 1A2. If you connect the DH30 to an extension jack of a more modern PBX, you should first check to see if those wires are used for signalling or power. If so, do not connect them to the DH30.
  • Page 33 The RS232 port on the DH30 is a serial communications port used to control DH30 operations through an external device such as a PC or a control device. This section describes the protocol and serial commands used to control the DH30.
  • Page 34 After a command has been sent, including the carriage return, the command is echoed back in uppercase with the new value followed by a DH30> command prompt. For example, a command to turn Cue on would be formatted like this: CUE 1<cr>...
  • Page 35 DH30 Product Manual DH30 a eCtion uDio The diagram below shows all the audio inputs and outputs and associated gain blocks and mixing junctions. The inputs are on the left (however, the Telco l and S jacks are both input and output). The outputs are on the right.
  • Page 36 Changes or modifications not expressly approved by Comrex Corporation could void the user’s authority to operate the equipment. A label containing the FCC registration number and Ringer Equivalence...
  • Page 37 DH30 Product Manual If you experience problems with this equipment, contact Comrex Corpo- ration, 19 Pine Road, Devens, MA 01434 or by telephone at 978-784-1776 for repair and warranty information. If the trouble is causing harm to the telephone network, the telephone company may request you remove the equipment from the network until the problem is resolved.
  • Page 38 In the event of problems, you should contact your equipment supplier in the first instance. Network Compatibility Declaration Comrex Corporation, 19 Pine Road, Devens, MA 01434 USA declares that the product Digital Hybrid 30/DH30/910-012-302 is designed to be com- patible with the following networks: Austria, Belgium, Denmark, Finland,...
  • Page 39 DH30 Product Manual eCtion efineD resets orksHeet Use these worksheets to record the presets you configure for your site. For descriptions of the menu options, refer to “Viewing or Changing Settings” through the LCD Panel on page 17. Menu Submenu...
  • Page 40 Comrex Corporation Menu Submenu Submenu Submenu Factory User User User Categories Selections Parameters Ranges Default Preset 1 Preset 2 Preset 3 Echo Mix-minus/AEC Canceller Echo Reduction Normal Soft Normal Aggressive Maximum EC Train Diagnostics TERL TNLP AERL ANLP Test Signal...
  • Page 41 DH30 Product Manual eCtion lossary AES/EBU — Audio Engineering Society/European Broadcasting Union. The protocol for communicating two-channel digital audio information over a serial link. AEC — Acoustic Echo Cancellation. The process of removing echo before it returns to its source.
  • Page 42 Null — The ability of the analog hybrid to separate send audio from caller audio. (Also known as trans-hybrid loss or side tone.) Off — The DH30 front panel control that disconnects callers who are active on the system. This control does not affect DH30 power.
  • Page 43 Sometimes known as a POTS (Plain Old Telephone Service) line, this is an analog line required by fax machines and modems. The DH30 requires analog telephone lines for its phone line connection. PBX systems or other digital telephone systems must be equipped with an analog extension for use with the DH30.

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