Comrex DH30 Product Manual
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Comrex DH30, Comrex Corporation 14 handling callS Receiving a Call — To set up the DH30 for automatic answer or discon- nect, refer to “System Parameters” (pages 25–26). • On-Air — When a call rings on the telephone line connected to the DH30, the On LED will flash and the telephone connected to the SEt output will ring. Answer the call by pressing the On button or activating the hybrid from your remote console control (if ap- plicable). This routes the call through the hybrid, and the green On LED illuminates. Upon connection, the DH30 automatically adjusts to line conditions. • Off-Air — Answer the call by picking up the telephone handset and talki
Comrex DH30, Comrex Corporation 22 seCtion 5 Customizing your system The Caller Processing menu category in the LCD panel includes six sub- menu items for controlling various facets of the caller audio. EQ (Equalizer) — The equalizer function is used to modify the tonal qual- ity of the caller audio. The basic function is a simple three-band graphic equalizer. The adjustments to each band determine how much adjustment is made to the caller audio signal. When active, the caller equalizer will have the following characteristics: • LowBand = 250 Hz – 715 Hz • MidBand = 715 Hz – 1,645 Hz • HiBand = 1,645 Hz – 3,500 Hz Adjustment in each band is f
Comrex DH30, DH30 Product Manual 13 -36 -24 -12 -3 -4 0 +4 +8 Send -36 -24 -12 -3 -4 0 +4 +8 Caller VU Meters (Send and Caller) — These LED’s indicate the audio levels at the SEnd and CAllEr XLR connectors. The SEnd meter indicates the level of the audio sent to the caller. The input gain should be set so that the average send level is at 0 dBU with occasional peaks to +4 dBU. The CAllEr meter indicates the level of the audio being received by the hy- brid. Caller processing (compressor, EQ, gain and the other caller process- ing parameters) is reflected in the CAllEr meter reading. Volume �
Comrex DH30, DH30 Product Manual 31 seCtion 7 pinouts remote connector 4 N/C GROUND 5 Pin Description 1 N/C RXD TXD 3 2 N/C 6 7 N/C 8 N/C 9 Pin Description N/C rS232 connector 4 Remote Cue * Switch/Indicator Common Select Preset 1/Send Mute * 5 6 Pin Description 1 Remote on * Remote Record * Remote off * 3 2 Select Preset 2/Caller Mute * 7 N/C 8 Unbalanced Send # 9 13 N/C Remote on Indication ** 14 15 10 Unbalanced Caller ## Select Preset 3/Monitor Mute* Unbalanced Aux Out ### 12 11 Record Indication ** 16 Cue Indication ** 17 Indicator Common 18 22 Unbalanced Audio Common # 23 24 19 Send Presence Indicator ** Indicator Common Caller Presence Indicator ** 21 20 Switch Common 25 P
Comrex DH30, Comrex Corporation 2 Section table of Contents (Cont.) 7 .........PinoutS ................................................................................................ 31 ........................ remote connector ................................................................... 31 ........................rS232 connector ..................................................................... 31 ........................record control ........................................................................ 32 ........................lin
Comrex DH30, Comrex Corporation 18 The DH30 allows the pre-configuration of up to three complete usage pro- files through the Presets menu. 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 can edit current parameters or you can choose to restore the values in that preset to the factory defaults (Recall Defaults option). Any time you change values within the LCD menus, you are changing the values of the selected preset. O
Comrex DH30, Comrex Corporation 4 seCtion 1 introDuCtion Simply put, a hybrid is a device that separates send and receive audio on a phone line. While the public switched telephone network utilizes separate channels for audio in each direction of a phone call, these two signals are mixed together before being sent to the end user. This way, only one pair of wires is required from your telephone to the telco central office. To use telephone company terms, the telephone network is a “4 wire” system, while the local loop is a “2 wire” system. When recordin
Comrex DH30, Comrex Corporation 34 The structure of serial commands is an option/value, followed by a carriage return: command x Commands can be either UPPER CASE or lower case terminated by a car- riage return. Characters are not echoed back to the sending device as they are sent. 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> (CUE =funct
Comrex Corporation 36 seCtion 10 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 interfer- ence when the equipment is operated in a commercial environment. This equipmet generates, uses and can radi
Comrex DH30, DH30 Digital telepHone HybriD Section Section Section Section table of Contents 1 .........introduction ......................................................................................... 4 ........................ What iS a hybrid? ...................................................................... 4 ........................dh30 FeatureS ........................................................................ 4 ........................What comeS With the dh30? .................................................... 6 ........................Product regiStr
Comrex DH30, DH30 Product Manual 17 The table below summarizes the settings available through the LCD panel. Refer to “User-Defined Presets Worksheet” (pages 39-40) for a worksheet version of this chart. vieWing or changing SettingS through the lcd Panel Menu Category Selections Function Defaults Presets Store 3 Sets of Unique Configurations that can be Selected Select Preset Selects Preset 1, 2, or 3 - loads all parameters associated with selected preset 1 Copy Preset Copies settings from the active preset into one of the other two presets N/A Recall Default Restores settings to
DH30 Product Manual 35 seCtion 9 DH30 auDio flow 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 lInE and SEt jacks are both input and output). The outputs are on the right. Send In (XLR) Send In (DB25 Pin 9) Cue In (XLR) Telco Line (RJ-11) Telco Set (RJ-11) Monitor (1/4" Phono)
Comrex DH30, Comrex Corporation 42 DSP — Digital Signal Processing/Processor. Echo Cancellation — Digital removal of speaker audio that is picked up by the microphone. Equalizer — A device that allows the user to tailor frequency response. Expander — More accurately called the downward expander, this suppress- es noise when the caller is not talking. Handset — The hand-held part of a communications system, usually con- sisting of a speaker and microphone. Hybrid — See Telephone Hybrid. Latching — A control signal that remains in a fixed state until you release it. This is opposed to momentary control, which is a pulsed signal
Comrex DH30, DH30 Product Manual 5 • Programmable auto-answer, auto-disconnect and caller control functions. • Call monitoring capability with a built-in 2-watt monitoring amplifier and front-panel volume control. • AES/EBU connections allow for a direct digital audio link between the DH30 and a digital console. • Analog connections are made using the send and cue inputs and the caller and aux outputs. • Each input and output has its own adjustable gain control, ensuring the best audio mix in every application. • The DH30’s 24-bit digital signal processing (DSP) produces high-quality audio with expansion, compression, eq
DH30 Product Manual 9 Send In — This is the audio that the caller will hear. Connect a mic or line output from the studio console to the SEnd In input of the DH30. If the DH30’s echo canceller feature is disabled, you must send mix-minus audio to the SEnd In connector. If you are using a microphone connected directly to the DH30 that requires phantom power, you will
DH30 Product Manual 19 seCtion 4 auto mix-minus anD aCoustiC eCHo CanCellation The DH30 can cancel two types of echo — electronic and acoustic (room) echo. By setting the mix-minus/acoustic echo cancellation, you can cancel either or both types of echo. Electronic Echo — is the echo caused by the caller’s audio being sent back to the caller through the mixing co
Comrex DH30, Comrex Corporation 40 Menu Categories Submenu Selections Submenu Parameters Submenu Ranges Factory Default User Preset 1 User Preset 2 User Preset 3 Echo Mix-minus/AEC Off On Canceller On Echo Reduction Off Normal Soft Normal Aggressive Maximum EC Train Off Off On Diagnostics Off Off TERL TEC TNLP TDB AERL AEC ANLP ADB Test Signal Off Off Receive Transmit Rcv & Transmit System Auto Answer Off Off On Auto Disconnect Off Off Loop Drop Only Call Prog Only Loop Drop + CP Remote Control Momentary Momentary Latching Remote
Comrex DH30, DH30 Product Manual 37 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. No user serviceable parts are contained in this product. If damage or mal- function occurs, contact Comrex Corporation for instructions on its repair or return. This equipment cannot be used on telephone company provided coin ser- vice. Conne
Comrex DH30, Comrex Corporation 10 additional connectionS Telephone Line Connections — The DH30 operates on one standard POTS (plain old telephone service) analog telephone line or one analog extension from a PBX via a standard RJ11C modular jack. Note: Some telephone lines 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 lInE jack. Set — Plug your telephone set into the r
Comrex DH30, DH30 Product Manual 27 Remote Aux Pins — This feature offers pin reassignment to the preset/mute audio pins. When Mute Audio is selected — Mute Caller mutes the caller audio, Mute Monitor mutes the monitor output, and Mute Send mutes the send audio. When Select Presets is selected, you can choose between three user-programmed settings by activating the associated preset pin. See Section 7 on pages 31-32 for pinout information. Send to Aux — This option determines the type of send audio that goes to AUx OUt and AES/EBU SEnd output. Audio types include Off, Processed (ech
Comrex DH30, DH30 Product Manual 39 seCtion 11 user-DefineD presets worksHeet 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 Categories Submenu Selections Submenu Parameters Submenu Ranges Factory Default User Preset 1 User Preset 2 User Preset 3 Presets Select Preset Preset 1 Copy Preset n/a Recall Default n/a Gain Send In Gain -20 to 20dB 0dB Send In Preamp Line Line Mic Cue In Gain -20 to 20dB 0dB Cue In Preamp Line Li
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