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2/4-WIRE LOOP TEST SYSTEM

LEASED LINE TESTING

2/4-Wire Loop Test System
Models 51950 & 51951 Test Sets

The Model 51950 Test System enables rapid single-person testing of leased or private-line circuits between a control/monitoring center and its remote sites.
The 51950 can be configured for measuring both the transmit and receive losses of either 2- or 4-wire loops. In applications where a loop is transported over multiple spans, each span can be individually tested by installing several units. Repair services can be rapidly dispatched to the problem area the first time.

Alarm sense leads can also be remotely checked by the 51950.

Key Benefits

Provides Remote Controlled Testing of 
Transmission Levels in Both Directions

Can be Configured to Test Multiple Spans

Rapid Single-Person Testing; Entire Test
Takes About 3 Seconds to Complete

Available in 2-, 6-, and 24-Circuit
Configurations

Tests are Controlled Via a PC Using Any
Terminal Emulation Software, Such as
Microsoft Hyperterminal

Tests Can Be Controlled Remotely Via a
Dial-Up Circuit

Logs Time-Stamped Test Records

Monitors and Reports Status of Up to
7 Remote Discrete Input Alarm/Status
Contacts Per Remote Unit

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Typical Single-Span Test System Application

2/4-Wire Loop Test Application

Typical Multi-Span Test System Application

2/4-Wire Loop Test Application

The 51950 is a dedicated test system that checks for transmission loss or failure over circuits with either 2-wire or 4-wire analog interface access points. Using a PC, a technician can activate an audio level test between the base unit and any of its remotes. Transmission loss is reported in dB's for both directions of the line under test. In applications where multiple remotes are placed on the same loop, each remote can be tested separately. Each unit also contains multiple sense leads that can be checked via the PC over the existing loops.

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Model 51950 Specifications

  • CONFIGURATIONS:
    • 2 Circuit (Model 51951)
    • 6 Circuit (Model 51950F1)
    • 24 Circuit (Model 51950F2)
  • LINE TESTS:
    • Measures Transmission Loss from Base Unit to Remote Unit: +26dB to -30dB in 1dB Increments
    • Measures Transmission Loss from Remote Unit to Base Unit:+26dB to -30dB in 1dB Increments
  • TEST TIME:
    • Total Test Time: 3 Seconds
  • TEST TONE GENERATION:
    • Amplitude: Adjustable +0, -10, and -20 dBm @ 1004 Hz
  • DATA COMMUNICATIONS PORT (Model 51950):
    • One RS-232 Serial Port via DB9 Connector
    • VT100 (ANSI) Protocol
  • TIP AND RING INTERFACE:
    • 51950: Std. Telco 25-Pair 50-Pin Connectors
    • 51951: Std. Modular Connectors
  • ALARM/STATUS MONITORING:
    • 51950: Contacts Monitored - 7 total
    • 51951: Contacts Monitored - 2 total
  • ALARM CONTACTS:
    • Closed on Alarm State
    • 60V AC/DC at 0.25A
  • COMPLIANCE:
    • UL 1950
    • FCC Parts 15 and 68
  • ELECTRICAL:
    • Input Power: 8 to 16 VDC @ 0.5 Amp (115Vac transformer provided)
  • ENVIRONMENTAL:
    • Operating Temperature:  0 to 40C
    • Storage Temperature:  0 to 95C
    • 0% to 95% Non-Condensing
  • MECHANICAL:
    • 51950 Dimen: 14.0"W x 3.0"H x 9.78"D
    • 51951 Dimen: 7.1"W x 1.26"H x 9.45"L
    • 51950 Wt: 6.06 lbs
    • 51951 Wt: 1.7 lbs 
    • 51950 Mtg: Wall or 19" Rack
    • 51951 Mtg: Wall or 19" Rack (Mtg Kit Optional)

 

 

Copyright United Data Corporation, Inc.

 

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