background image

 

15

cable is tried on the LAN, it does not 
work .This is because the lack of the proper 
pairing causes excessive cross talk in the 
cable, preventing the LAN from working. This 
type of cable fault is sometimes call a split 
pair or double split pair to detect this type of 
fault, a more sophisticated tester capable of 
performing a NEXT test(Near End Cross Talk) 
must be used. Both the Pair Master and LAN 
TDR can perform NEXT tests.   

Notes:  
Cross talk increases with the length of the 
cable. A LAN system will tolerate a certain 
amount of cross talk. A short cable (10ft or 
less) that is improperly paired may work just 
fine. However, longer cables paired in exactly 
the same way, may not work. This explains 
why an installer can make short jumper 
cables that work (although they are 
improperly paired), but when he installs 
RJ-45’s in exactly the same way on a longer 
cable, the cable does not work.   

6.3. 

The 

CABLE SNIFFER-REMOTE

 says 

my phone cable is bad, but my phone 
works ok. 

 

Most single line telephones only use 2 wires 
in a modular cable the modular cable, which 
terminates in RJ-11 connectors could have as 
may as 6 wires in it. The unused wires may 
have faults, which the 4 in 1 identifies, but 
these faults may have no effect on the 
working 2-wrie telephone circuit. Many 

Summary of Contents for MT-7057N

Page 1: ...ABLE SNIFFER REMOTE MT 7057N User s Manual 1 st Edition 2016 2016 Copy Right by Prokit s Industries Co Ltd Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot co...

Page 2: ...1 Contents INTRODUCTION 2 SAFETY and WARNING 2 PRODUCT FEATURES 5 SPECIFICATIONS 6 FRONT PANEL 6 ACCESSORIES 7 OPERATION 8 CABLE REPAIRE 12 MAINTENANCE 16...

Page 3: ...s or reverse wired telephone cables SAFETY WARNINGS 1 Read instructions carefully before using this tester Failure operation may result in damage to the tester or injury to the users 2 Do not use this...

Page 4: ...echnicians who know the dangers of and the safety rules applicable to this type of equipment Failure to observe this precaution may result in damage to the tester or injury to the user 7 Do not touch...

Page 5: ...ent Condensation of water inside and outside of the tester may produce dangerous conditions Allow the tester to warm to room temperature before using 14 Do not modify this tester Changing the design m...

Page 6: ...rom the battery could damage the tester PRODUCT FEATURES 1 Test 4 types of cables 2 Simple one button test 3 Ergonomic portable handheld design 4 Tests installed wiring or patch cables 5 Remote unit s...

Page 7: ...lug on other end BNC cables with male connectors 2 Faults Indicated No Connection Short connected crossover 3 Low Battery Indicator LED light up to indicate low battery 4 Case Dimensions 6 3x3 4x1 0 i...

Page 8: ...7 ACCESSORIES 1 RJ45 to BNC female connector 2 Instruction manual 3 Pouch bag...

Page 9: ...able cannot be tested simultaneously 2 The MAIN and REMOTE unit The CABLE SNIFFER REMOTE consists of a Main unit and a Remote unit The Remote unit stores conveniently on the bottom of the Main unit It...

Page 10: ...nit Once detached the Remote can be attached to one end a cable and the Main unit attached to the other to the other end of the cable These ends are often in different rooms and on different floors of...

Page 11: ...LED Corresponding to the type of cable being tested must light Examine the table below the Numbered LEDs noting what LEDs should light If all of the LEDs do not light the cable has an OPEN fault If a...

Page 12: ...Note In the SHORT mode the Numbered LEDs only indicate the location of the shorts The other Numbered LEDs are dark If more than 3 numbered LEDs light there may be multiple shorts in the cable 6 6 Cro...

Page 13: ...sharply around a corner punctured by a nail or staple over loaded hit by lighting etc Similar abuses will damage the connectors on the ends of the cable The connectors can also be damaged by excessive...

Page 14: ...y seldom occur as the result of a badly crimped RJ connector so the user should suspect a problem with the wire possibly a staple or mail through the wire or a crushed or pinched wire if the 4 in 1 in...

Page 15: ...ired straight through Crossover cables used on LANs are purposely mis wired with their Receive and Transmit wires cross over The CABLE SNIFFER REMOTE will test this as a bad cable but it may work just...

Page 16: ...cross talk A short cable 10ft or less that is improperly paired may work just fine However longer cables paired in exactly the same way may not work This explains why an installer can make short jump...

Page 17: ...and the answering machine may not answer when the line rings MAINTENANCE Your CABLE SNIFFER REMOTE is a precision test instrument and when used as described in this manual should not require maintenan...

Reviews: