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Last Volume in series
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? The Phone System ?
? Part IV ?
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MORE ON BRIDGING HEADS
If you've been keeping yourself up to date in this
series, then you should know what they are, and how to use
them. They are an essential tool to the phone company
network. With new services and features that are fairly new,
bridging heads can be found in new areas. They are those
little grey boxes marked Pacific Bell.
They can be found at random places, normally out of the
sidewalk next to a telephone pole. You may find them even in
the middle of a field, but they are still the same. You
should know that cable trunks run parallel with streets to
provide service to all the houses on that street. The trunks
must surface every block or so to give lines to the houses on
the block. When they surface, a bridging head is put over it
to house the wiring.
There are basically 5 types of bridging heads. Some
very small, and others looking like refrigerators. They all
have the same purpose. First, you should know how to
identify a head, and what is in it. The codes for the heads
are: A, B, C, D, E. Now, take a brief look at the file
"HEADS.ANS." You should know how to refer to one. Different
heads have different functions, so you should learn what to
expect when you open them.
Head Bridge Terminal Test Set Connection Strip
Type Blocks Boards Connectors Strips Shelves
------------------------------------------------------------
"A" S S
"B" * * S
"C" S S S
"D" S S S * *
"E" S
------------------------------------------------------------
S - Sometimes
* - Always
TEST SET CONNECTORS: Used for test sets. Has two terminal
posts in the center of a circular spool which has a wire
wrapped around it. At the end of the wire is a clip
specially made for the terminal boards. Attach the
alligator clips from your test set onto the posts, then
use the wire on the terminal board.
BRIDGE BLOCKS: Used for Trunk-to-line connections. Should
have 2 rows of terminals. About 1 1/2" wide and 1 1/2'
tall. Attach test set clips to the 2 posts in each set.
TERMINAL BOARDS: Massive boards with rows and rows of
colored screws. Screw heads should have a plastic color
guard, with the wire connections behind them. Each pair
is one line. The special clip at the end of the wire of
the test set connector is made for these boards. 2 are
usually found side by side in model B's.
CONNECTION STRIPS: White plastic strips with approx. 20
wires looping in it. Possibly "inactive" lines for
future inplementation.
STRIP SHELVES: Shelves which hold connection strips at a 45
degree angle. Usually have wire spool holders at the
top of them.
And now to opening the head. All the heads use a 7/16"
bolt to secure them. Type A's, and D's can be opened from
either side.
Type A, B, D, E: Turn the 7/16" bolt counter clockwise, and
The latch should swing up. If not, hold the bolt in
place, and swing up. To close it, just swing the lever
down to the original position. You should hear the
assembly "click" when you swing it down.
Type C: There should be a 7/16" bolt on either side of the
box about a foot from the ground. It will have a metal
shield around it. Loosen the bolt, and lift UP and OUT
on the front handle of the door. Pull it down after the
bolt has cleared the notch.
When inside, check for equipment. Sometimes, wrap ties,
test sets, and test equipment are left there. After that,
have fun with the terminals. Use your test set and check
lines, make calls, what ever you want. But remember, don't
ever, ever, do any damage. Examine the cable trunk, the
connection assemblies, and the rest. When you are finished,
always shut the head and leave it the way you found it. The
lesson I'm trying to teach you, is to learn. Don't ever do
damage!
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