Charles 7305-14 4W-2W, Manual

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Section 730–514–202
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1. GENERAL
1.1 Document Purpose
This document provides general, installation, alignment and testing information for the 7305–14 and 7305–19
4W–4W/2W Prescription Line Amplifier SF to E&M modules.
1.2 Document Status
This document is reprinted to provide a general editorial update.
1.3 Equipment Function
The 7305–14 and 7305–19 4W–4W/2W Prescription Line Amplifier SF to E&M are 400-type plug-in combined
function modules (CFMs). Each combines the features and circuit of a 4-wire to 4-wire or 2-wire repeater and an
SF to E&M signaling unit. The CFMs differ only in that the 7305–19 contains the loopback function. The 7305–19
module is shown in Figure 1.
1.4 Equipment Location/Mounting
The units mount in TL40XX mounting assemblies or unwired 400-type mounting assemblies.
1.5 Equipment Features
The CFMs provide the following features:
1.5.1. Transmission
Switch-selectable 4W to 4W, or 4W to 2W operation
Switch-selectable line side terminating impedance of 150, 600 or 1200 ohms
4W station side terminating impedance of 600 ohms
2W station side terminating impedance of 600 ohms in series with 2.15 uF
Transformer coupled line and station Interface
Line side surge protection
Receive and transmit prescription gain or attenuation of 24dB in 0.1dB steps
Receive prescription (post) equalization for H88 loaded or nonloaded cable
2W port Build-Out-Network (BON)
Seven front-panel-mounted bantam test jacks; receive line and monitor; transmit line and monitor;
receive station out; transmit station in; and E&M drop (E-tip, M-ring) jack
Integral 2600Hz transmit oscillator
1.5.2. Signaling
Switch-selectable E&M interface: signaling mode (M-send, E-receive) or trunk mode (E-send,
M-receive)
Switch-selectable TYPE I, TYPE II or TYPE III signaling interface
Transmit and receive pulse correction
M-lead current limiting
Front-panel-mounted LEDs that indicate the status of the E&M leads