Instruction manual

Installation
025-9416 51
Telco
Radio Station Equipment
(Co-located transmitter,
Tx link controller, etc.)
Model 640
66-type
punchdown block
Figure 18. System Configuration with a 66-Type Punchdown Block
TELCO CONNECTIONS
The male 50-pin RJ21 connector on the rear of the Model 640 provides both trunk and radio
station interfaces for the paging terminal. As a result, even though the telco and transmitter
connections are accomplished separately (different installation instructions), they are not totally
unrelated. The following table shows the telco pinouts for the RJ21 connector. Shading indicates
the lead pairings for each of the four available trunks. This information is also printed on the rear
panel of the paging terminal for convenience. Pin #1 is the first signal - top, left and pin #50 is
the last signal - bottom, right.
Table 6. RJ21 Telco Pin Configuration
Pin # Label Description
1 RING 1-A ring lead 1 for trunk A
2 RING 2-A ring lead 2 for trunk A
3 M-A M (mouth) lead for trunk A
4 RING 1-B ring lead 1 for trunk B
5 RING 2-B ring lead 2 for trunk B
6 M-B M (mouth) lead for trunk B
7 RING 1-C ring lead 1 for trunk C
8 RING 2-C ring lead 2 for trunk C
9 M-C M (mouth) lead for trunk C
10 RING 1-D ring lead 1 for trunk D
11 RING 2-D ring lead 2 for trunk D