Beneath TB2 in Figure 35 is the terminal block for the last four Monitor Points (TB3), designated by a “@.” The
“ C ” tells you that this terminal
0
lock is located at the bottom of the standard relay board shown in ROW 2 of
Figure 32. As indicated by the ”
6
Y ” designation, the Monitor Points on TB3 are connected just like the sample
shown for TB2.
Connections for the BT’s Control Points are made at terminal block TBl, as shown in Figure 35. The reference letter
”
0
D ” tells you that TBl is located on the right-hand side of the standard relay board shown in ROW 2 of Figure
32. Notice that this terminal block has “FIG E” written beside it. “FIG E” refers to Figure E in the M-2120 initiating
wiring diagrams. See the referenced figure to determine the proper way to connect external devices to the Control
Points.
We have only described contractor connections for the first transponder in this particular cabinet. However, all
contractor connections are interpreted in the same way. For each transponder, be sure to:
l
Check both sides of the drawing for contractor connections.
l
Use the designated reference letter to physically locate the terminal block.
l
Refer to the data and power line system interconnection drawing to determine the possible source and
destination of data and power lines.
l
Refer to referenced figures in the M-21 20 initiating wiring diagrams to see how you connect external devices
to a transponder’s Monitor and Control Points.
Transponder Cabinet Drawings-Sample 2
We have discussed one sample of a 2120 transponder cabinet drawing. All such drawings are interpreted in much
the same way. However, there are two other aspects of 2120 systems that need some discussion: the audio sub-
riser configuration, and the telephone line interconnection.
Take a look at Figure 36. The transponder cabinet shown is quite similar to the one in Figure 32; the only difference
involves the audio and telephone line connections shown. Let’s focus on the contractor connections shown in the
second column to the right of ROW 1 (“CONTRACTOR CONNECTIONS/RELAY BOARD CONTROL
POINTS”). These connections are enlarged in Figure 37.
The terminal blocks shown in Figure 37 (TBl through TB3) are located on the audio relay board in ROW 1, as
indicated by the reference letter ”
0
D .” The Control Points on TBI are connected to speaker circuits for the 2120
audio system. Notice that the incoming audio line (“AUDIO SUB-RISER IN”) is also connected to terminals on
TBl. Therefore, the speaker circuits connected to TBl are fed by the 2120 audio sub-riser. Refer to the audio and
telephone line system interconnection drawing to determine the possible source of the incoming audio line.
Moving on to TB2, you can see that connections to this terminal block are made according to “FIG K” in the M-2120
initiating wiring diagrams.
Finally, look at TB3. Connections for the incoming telephone line are made at this terminal block, along with the
associated telephone circuit. The telephone circuit itself is connected according to “FIG M” in the M-2120 initiating
wiring diagrams. Refer to the audio and telephone line system interconnection drawing to determine the source of
the incoming telephone line.
In Figure 36, the telephone line continues from the last transponder at the cabinet; the audio line ends at the last
transponder in the cabinet (ROW 3). If there had been other audio speaker circuits in the system, the outgoing audio
line would have been connected to appropriate terminals on TBl in ROW 3.
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