OneTouch Series II
Users Manual
4-2
Cable Autotest
Press (Cable Autotest) to measure cable length,
detect split pairs, and/or perform a wiremap test. The
Network Assistant does not measure cable length when it
detects a link pulse (i.e., when connected to an active
device such as a Hub).
The Network Assistant also starts the fiber tests
automatically if a DSP-FOM is connected and turned on
when you press (Autotest). Read “Test Fiber Optic
Cable” later in this chapter.
Split Pairs
The Network Assistant automatically checks for split pairs
whenever Autotest or Cable Autotest is run. It will not
check for split pairs if the end of the cable is attached to a
Hub, a cable identifier, or the internal Wiremap
connection. Disconnect it to obtain a complete test.
Note
The cable under test must be longer than 20 feet.
The Network Assistant can identify split pairs that occur
either at the connector or at an intermediate point, such as
a punchdown block.
Cable Length Results
When displaying cable length, the Network Assistant
always reports the length to the first fault (e.g., opens,
shorts, or split pairs). It shows the distance to the fault
and to the end of the cable on the same pair as illustrated
in the following example test results table.
Pair
Length Status
1,2 135 ft Open
3,6 91 ft Split Pair
4,5 135 ft Open
7,8 91 ft Split Pair
In the case of pairs 3,6 and 7,8 there is a split pair at 91
feet and it is most likely that both pairs continue for the
entire cable length of 135 feet.
A split pair at the connector is represented as Split/Open?
with a length of less than 5 feet (1.5 m). A Split/Open?
indication could also be an open at the indicated distance.
Wiremap Cable
The Wiremap Cable test verifies pin-to-pin continuity from
the near to the far end of the cable, making it easy to
identify miswires (the most common installation problem)
and other wiring errors.
