Ethernet Wire Map
This test is to ensure that the two ends
have been terminated pin for pin, i.e. that pin 1 at the patch panel goes to pin
1 at the outlet, pin 2 goes to pin
2 etc. etc. The wire map also checks for continuity, shorts, crossed pairs,
reversed pairs and split pairs. A Split pair is probably the only thing that
requires an explanation here, as they are undetectable with a simple continuity
tester, this is because pin for pin they seem to be correct. As explained on the
Cabling Basics page,
operation requires that the signal is transmitted over a pair of wires that are
twisted together, with a 'split pair' the signal would be split between two
Null Modem Cables
A null modem cable connects two standard serial ports for the purpose of
computer-to-computer networking. Null modem cables enable data transfer
between two computers with a minimum of setup required. This technology is
also used in the UNIX and Linux arena for printing purposes.
A leased line is a cable connecting two specific locations for voice and/or
data network service. Leased lines most commonly are rented by businesses to
connect branch offices.
RJ-45 Connectors and Cables
RJ45 is a standard type of connector for network cables such as those used
in Ethernet networks. RJ45 connectors feature eight pins to which cables
Fiber Optic Cable
Fiber optic cables carry information using pulses of light. These cables are
designed for long distance network communications, although fiber to the
home installations are becoming more common.
An ADSL line is a cable connecting providing internet connectivity for
voice and/or data network service. ADSL lines most commonly are rented by businesses
gain connectivity to the internet.