Section 365–336–202
2
1.
GENERAL
1.1
Document Purpose
This practice provides general, application, circuit, optioning, installation and testing information for the Charles
Industries 3653–36 4-Wire Transmission Only with Extended Range and Loopback (4W TO/ER/LB) channel unit,
shown in Figure 1.
1.2
Document Status
This document is reprinted to include a general editorial update
1.3
Equipment Purpose/Description
The 3653–36 provides a direct interface between 600 ohm 4W VF or voiceband data (modem) circuits and the
360/363 D4 Digital Carrier Terminal common equipment.
1.4
Equipment Location/Mounting
The 3653–36 is mounted in a Wescom 360/363 D4 Channel Bank or Digital Carrier Terminal.
1.5
Equipment Features
The 3653–36 provides the following features:
Complies with AT&T Pub. 43801 Specifications
Accommodates transmit and receive TLP levels from –19.5 to +13dBm
Provides 600 ohms impedance at the 4W port interface
Provides 2713Hz tone-activated loopback
Provides selectable 4-min/20-min/none loopback automatic timeouts
Provides selectable tone loopback disable
Prescription adjustable loopback level of up to 31.5dB of gain/attenuation in 0.5dB increments
Front-panel manual loopback switch
Front-panel-mounted bantam jacks for accessing the transmit and receive ports
Front-panel LED indicating loopback status
Optional sealing current configuration with automatic ZAP
2.
INSPECTION
2.1
Inspect for Damages
Inspect the equipment thoroughly upon delivery. If the equipment has been damaged in transit, immediately re-
port the extent of damage to the transportation company.
2.2
Equipment Identification
Charles Industries’ equipment is identified by a model and issue number imprinted on the front panel or located
elsewhere on the equipment. Each time a major engineering design change is made on the equipment, the issue
number is advanced by 1 and imprinted on subsequent units manufactured. Therefore, be sure to include both
the model number and its issue number when making inquiries about the equipment.
2.3
Static Concerns
Each module is shipped in static-protective packaging to prevent electrostatic charges from damaging static-sen-
sitive devices. Use approved static-preventive measures, such as static-conductive wrist straps and a static-dissi-