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The LX200 uses Modular type Jacks and
Cables for most of it's external connections
Modular Plugs and Jacks are a type
used in many communications circuits and the
commonly used names are RJ-11,
RJ-45, etc. The RJ-XX stands for Registered Jack and are a series of
telephone connection interfaces registered with the U.S. Federal Communications
Commission (FCC). They derive from interfaces that were originally
part of AT&T's Universal Service Order Codes (USOC) and were adopted as part of
FCC regulations Part 68 Subpart F Section 68.502.
The modular plugs and receptacles (jacks) used in phone installations come in four
common sizes. The smallest size is RJ-H and you will find it on the ends of
the coil-cord that attaches the handset to a telephone. Look at the plug
and you will see four little brass conductors on the plug and four wires
inside the cable. This is described in some catalogs as a 4-4 connector which
means it has four positions on the plug and and it uses all
four contacts.
The next-larger size is the RJ-11, and this is the most common size in use.
This is a 6-4 connection, because it actually is large enough to have six
positions on the plug and jack, but only the four in the middle, or sometimes
two, are supplied.
The third size connector is the RJ-12. This is a 6-6 connector. It is the
same physical size as the RJ-11 but it is supplied with all six contacts and
wires installed.
The fourth size of modular connectors
is the RJ-45. This is an 8-8 connector. It is wider than the RJ-11 and RJ-12
(which are the same size, remember) and has eight positions on the plug
and jack and has eight wires in the cable.
Modular Pin Numbering.
On the LX200 facing the front
panel you will see the modular jacks with the keyways pointing down. I
number the pins 1 to n, left to right as in the figures below.
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