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Model 104001C
January 2014
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Prac_104001C0_RevB.pdf
Contents:
Section 1. General
1
Section 2. Application
2
Section 3. Installation
4
Section 4. Circuit Description
7
Section 5. Mechanical Outline
7
Section 6. Specifications
7
Section 7. Testing and Troubleshooting
8
Section 8. Maintenance
8
Section 9. Warranty
8
Figure 1. Circuit Description
9
Figure 2. Mechanical Outline
10
Figure 3. Typical Off-Premise-Station (OPS)
Circuit Using 104001C Line Amplifiers 2
Figure 4. Module Arrangement for Two
4Wire 6Way Resistive Bridges in an
Accurate 246 Mounting Assembly
2
Figure 5. Typical 4Wire DX Signaling
Application Using 104001C
Line Amplifiers
2
Figure 6. 4000C 1 Option Switch and
Strap Locations
4
Table 1. Typical Transmit and Receive
Equalization Frequency Response
3
Table 2. Terminating Impedance Selection
Guidelines
3
Table 3. Externals Connections to 104001C
4
Table 4. Equalized Gain Settings From
Cable Loss Data
7
Table 5. Test Guide Checklist
9
1. GENERAL
1.01
This practice provides application, specification, circuit and mechanical
description, maintenance, installation, and warranty information relating to
Accurate Electronics’ Prescription Line Amplifier, Model 104001C.
1.02
The 104001C Prescription Line Amplifier module ( Figure 1) provides
active prescription level control, active prescription amplitude equalization,
and impedance matching for the transmit and receive channels of a 4wire
voice-frequency transmission facility. The 104001C also contains two
independent sealing-current sources, one on the facility side and the other on
the terminal side of the module.
Note: Because the 104001C has identical equalizers in both cannels,
identical impedance-matching capabilities at all four ports, and identical
sealing-current sources on the facility and terminal sides, it can be used
either at an intermediate point or near an end point of a 4wire facility.
Although the terms “facility side” and “terminal side” do not strictly apply
in intermediate applications, these terms will for convenience, be used
throughout this practice as follows: Facility side will refer to the receive-
input, transmit-output side of the 104001C, and Terminal side will refer to
the transmit-input, receive-output side as shown in Figure 1. of this practice.
1.03
This practice section is reissued to cover the Issue 4 version of the
104001C module (Accurate Electronic part number 104001C). The Issue 4
Module is identical to its Issue 3 predecessor except for the addition of a
front-panel power-on indicator LED.
1.04
The 4001C’s transmit and receive amplifiers can be independently
prescription-set to provide from 0 to 24dB of loss or 0 to 24dB of gain in
their respective channels. For each channel, gain or loss is selected via a
front-panel slide switch. The desired amount of gain or loss is then
introduced into each channel in precise 0.1dB increments via a front-panel
DIP switch. The maximum output level of each channel is +10dBm, with
distortion at maximum output less than 1 percent.
1.05
All four ports of the 104001C module can be switch-optioned for
balanced 1200, 600, or 150-ohm terminating impedance. The impedance of
the two facility-side ports is selected independently from that of the two
terminal-side ports. The transformers at all four ports of the module are
center-tapped to derive balanced simplex leads.
1.06
In addition to active prescription level-control circuitry, the 104001C
contains active prescription slope-type amplitude-equalization circuitry in
both channels. The transmit and receive equalizers are identical, each
providing from 0 to 7.5dB of gain at 2804Hz (re 1004Hz). Equalization is
introduced into each channel independently, in 0.5dB increments, via DIP
switches on the module’s front panel.
1.07
The 104001C can be optioned to provide 25mA of internally generated
sealing current to metallic facilities on the facility and terminal sides of the
module, to accept externally generated sealing current from the far ends of
the facilities on both sides of the module, to derive normal simplex leads on
both sides of the module, or to provide bypassed (straight-through) simplex-
lead signaling via a path separate from the transmit and receive transmission
paths. Each of the 104001C’s two internal sealing-current sources has a
“ZAP” feature by which a greater amount of sealing current is provided for a
few seconds when power is initially applied to the module.
1.08
The front panel of the 104001C is designed so that all level and
equalization adjustments can be made while the module is mounted in place.
Six front-panel bantam-type test jacks facilitate alignment and maintenance.
Both bridging and opening jacks are provided at the facility-side ports;
ACCURATE ELECTRONICS INC
PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX 503.646.3903
WWW.ACCURATE.ORG
Practice Section 10model Rev B
PRESCRIPTION LINE AMPLIFIER
MODEL 104001C
