3653–37 2W/4W Transmission Only with Extended Range and Loopback (2W/4W TO/ER/LB) Channel Unit
■Document Purpose
▲This practice provides information on the Charles Industries 3653–37 2–Wire/4-Wire Transmission Only with Extended Range and Loopback (2W/4W TO/ER/LB) channel unit. The 3653–37 is shown in Figure 1. (For an Installation Guide covering installation and testing only, see Section 365–337–301.)
■Equipment Function
▲The 3653–37 provides a direct interface between 600 Ohm 2W or 4W VF (Data) circuits and the 360/363 D4 Digital Carrier Terminal common equipment.
■Equipment Features
▲The 3653–37 includes the following features:
◆Complies with AT&T Publication 43801 Specifications
◆Accommodates transmit and receive TLP levels from –19.5 to +13dBm
◆Switch-selectable 2W or 4W interface
◆Provides 600 ohms impedance at the 2W or 4W port interface(s)
◆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 (4W mode only)
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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January 2001 |
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Issue 1 |
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93 KB |
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