Tempo 468-G – Wiremap Tester

• Used to test four-pair data and voice cable links terminated with standard, modular, eight-position RJ45 jacks
• Features LEDs corresponding to each wire for easier diagnosis of mis-wires than conventional, pair-checking testers
• Built-in tone generator easily identifies cable at remote locations
• Connecting the receiver unit automatically activates the test process

The Tempo Communications 468-G Modular Cable Tester and Wiremap Tester are used to test four-pair data and voice cable links terminated with standard, modular, eight-position RJ45 jacks. It features sequentially lighting LEDs corresponding to each wire for easier diagnosis of mis-wires than conventional, pair-checking testers.

This handy tester identifies open and short circuits, reversed and transposed pairs with an alert if connected to an active circuit without harming the unit. Shielded ports test both shielded and unshielded cabling. It tests cables to T568A, T568B (AT&T 258A/10 Base T), and USOC wiring standards.

Before connecting a cable to the 468T, confirm the wiring sequence of the modular plug, then connect the cable to the applicable 468T jack. Tone can be delivered down any modular terminated cable by simply connecting the cable to the 468T transmitter. With the transmitter turned on, a sequencing tone is applied to each of the four jack pairs.

Using any Tempo inductive amplifier (probe), confirm tone signal is being applied by checking for tone at the near end (transmitter side) of the cable. Move to the remote end of the cable and locate the signal using the probe by moving near or touching the probe tip to the insulation of the suspect conductors or termination sites. The tone signal will be loudest on the subject cable or conductor. Tempo’s 200 series inductive amplifiers are ideally suited for this application.

Select the modular jack on the 468T that conforms to the wiring specification of the cable under test. The sequence of terminated wires is defined by the application to a specific system. The Model 468 provides testing of configurations shown to the right:

USOC wiring can be applied to 1, 2, 3, or 4 pairs of terminated conductors. Traditionally found in telecommunication systems, the USOC wiring sequence provides limited compatibility between 8-position and 6-position modular plugs. Although the 6-position plug sequence matches the 8-position plug sequence, inserting a 6-position plug into an 8-position jack can damage the #1 and #8 pins within the jack. The use of a 6-position to 8-position adapter is recommended for this application.

T568A and T568B configurations are used in both data and telecommunications applications. The two configurations are similar in format with the exception of pairs 2 and 3 being reversed. T568A is often preferred, as it is compatible with pairs 1 and 2 of the USOC wiring specifications. The T568A wiring configuration is comparable to the AT&T 258A specification.

10Base-T wiring is commonly found in network applications. The 10Base-T wiring sequence uses only two pairs and is compatible with pairs two and three of T568A and T568B sequencing.