Triplett Line-Bug 4 (Catalog # 9615)
The Indicator Lights
An RJ-11 circuit can have as many as 3 circuits present.. so 1, 2, or 3 lights may come on with a "good" circuit, with each illuminated light indicating the presence of a telephone line. If the lights are Green, the polarity is normal. If the lights are Red, the polarity is reversed. Often, telephone circuitry will work OK with reversed polarity, so, in general, a Red light is not a reason for concern. If no lights come on when the RJ-11 plug is connected to a mating jack, the jack is either disconnected from telephone service, or it is wired differently than a standard telephone jack.
An RJ-45 circuit can contain as many as 4 telephone lines... so 1, 2, 3, or 4 lights may come on. As before, if the lights are Green, the polarity is normal. If the lights are Red, the polarity is reversed. If no lights come on when the RJ-45 plug is connected to a mating jack, move the switch to its opposite position and see if any lights come on. If lights do not come on in either position, the jack is either disconnected from telephone service, or it is wired differently than 568 A/B or USOC.
Telephone lines cause a telephone to ring by rapidly reversing the polarity of the telephone current. This causes the light on the Line-Bug 4 to rapidly change color from Green to Red. and it looks Amber. When a pulsating Amber light is seen, the phone line is ringing. Care should be exercised when testing a ringing telephone line. In addition to reversing the current, the voltage is also boosted. A ringing telephone line can deliver a pretty good electrical shock. so be careful.
LAN Systems and Telephone Lines
Many LAN Test Sets were not designed to be connected to telephone lines. An unprotected Test Set can be damaged by inadvertent connection to a telephone line. The Line-Bug 4 gives the LAN Test person an inexpensive way to determine if telephone current is present on an RJ-45 connection, before plugging his expensive LAN Test Set in.
Using the Line-Bug 4
Frequently Asked Questions
Q: Does the Line-Bug 4 tell me if a LAN jack is connected to a LAN system?
Q: Does the Line-Bug 4 tell me if the line is a 'digital' phone line.
*Note: Products designed to work on analog telephone lines are often damaged when plugged into digital phone lines. Digital phone lines are seen most often in hotels and businesses.
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