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ACCURATE ELECTRONICS 104003C Manual
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Page 1 of 10Model 104003CJanuary 2014This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without writtenpermission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.Prac_104003C0_RevA.pdfContents:Section 1. General 1Section 2. Application 1Section 3. Installation 2Section 4. Circuit Description 6Section 5. Mechanical Outline 6Section 6. Specifications 6Section 7. Testing and Troubleshooting 7Section 8. Maintenance 7Section 9. Warranty 7Section 10. Condensed Alignment Procedures 8Figure 1. Circuit Description 10Figure 2. (see Figure 5.)Figure 3. Hypothetical Circuit Employing 104003CLine Amplifiers 2Figure 4. 4Wire Circuit Employing DX signaling 2Figure 5. Module Switch Locations 4Figure 6. Preliminary Alignment Procedure –No Equalization 8Figure 7. Final Alignment Verification –No Equalization 8Figure 8. Preliminary Alignment Procedure –with Equalization 8Figure 9. Final Alignment Procedure –with Equalization 9Table 1. Installer Connections to 104003C 3Table 2. Transmit and Receive ChannelEqualized Gain Optioning 3Table 3. Loopback Frequency Selection 4Table 4. Loopback Level Selection 4Table 5. Test Procedure 101. GENERAL1.01 The Accurate 104003C Line Amplifier with Loopback module providesswitch-selectable level control, equalization, and impedance matching inboth the transmit and receive channels of a 4wire voice-frequencytransmission facility. Additionally, the 104003C provides tone-activated ordc-activated equal-level loopback of the facility.1.02 The 104003C’s transmit and receive amplifiers in the 104003C may beindividually switch-optioned to provide up to 24dB of either flat gain or flatloss in 0.1dB increments. Maximum output level of each channel is +7dBm,with less than 1% distortion.1.03 Equalization in both the transmit and receive channels may beprescription-set to introduce up to 7.75dB of slope equalization from 1000 to3000Hz in 0.25dB increments. The module’s equalized gain adjustments aredesigned to provide frequency response within + 1dB over the 300 to 3000Hzrange when used on nonloaded cable facilities.1.04 The 104003C may be switched-optioned to match 1200, 600, or 150-ohm impedances at both the facility and terminal ports. Transformersassociated with each of the ports are center-tapped to derive balanced simplexleads that provide for DX, loopback, and other signaling schemes that requirea dc path.1.05 The 104003C provides loopback toward the facility for remote testingof the circuit. Loopback may be tone or dc activated. In the tone-activatedmode, 1 of 11 loopback-activation frequencies may be switch-selected;loopback is released in response to the reapplication of loopback tone (two-tone-burst operation). Loopback levels of +16dB, +9dB, -16dB, or –23dBmay be prescription-set. In the dc-activated mode, the 104003C activatesloopback for the duration of a locally applied ground signal.1.06 Auxiliary loopback relay contacts are available at 104003C’s 56-pinconnector to light an external loopback lamp or disable an associated data setin data applications.1.07 The front panel of the 104003C is designed so that level adjustmentscan be made while the module is mounted in place. The 104003C features afull complement of front-panel test jacks to facilitate alignment andmaintenance activities. Both bridging and opening bantam-type jacks areprovided at each port. A red light-emitting diode (LED) on the front panellights when the 104003C is in the loopback mode.1.08 The 104003C incorporates an internally regulated power supply thatpermits operation on –22 to –56Vdc filtered input. Current requirementsrange from 30mA in the quiescent state to 65mA with both the transmit andreceive channels at maximum output. A green LED on the front panel lightswhen power is applied to the module.1.09 Surge protection in provided for the input and the output of both thetransmit and the receive channel. Reverse-battery protection and transient-limiting circuitry are provide in each channel’s internal power supply circuit.1.10 As a Type-10 module, the 104003C mounts in one position of a Type-10 Mounting or apparatus case installation. In relay rack applications, up to12 modules may be mounted across a 19-inch rack, while up to 14 modulesmay be mounted across a 23-inch rack. In either case, 6 inches of verticalrack space is used.2. APPLICATION2.01 The 104003C Line Amplifier with Loopback is designed for use on4wire voice-frequency transmission facilities, where it provides bi-directional level control, amplitude equalization, and impedance matching.In addition, the module’s tone or dc-activated loopback circuitry allowsremote testing of the facility. Thus, the 104003C is equivalent to a 4wire-to-4wire voice-frequency repeater with loopback. The 104003C may be usedas either a terminal or an intermediate repeater. Figure 3 shows a hypotheticalACCURATE ELECTRONICS INCPO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX 503.646.3903WWW.ACCURATE.ORGPractice Section 104003C Rev ALINE AMPLIFIER with LOOPBACK MODULEMODEL 104003C |
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