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Installation
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3. The RING/TIP pair provides two-way audio for DID, end-to-end, and E&M 2-wire tie trunks. The pair also
provides “to telco” for E&M 4-wire to CO trunks.
4. The RING1/TIP1 pair is
not
used with DID, end-to-end, and most E&M 2-wire tie trunks. The pair only
provides “from telco” for E&M 4-wire to CO trunks.
q
3.
Use bridging clips or wire to connect the middle terminals of each row. Again, the
appropriate connections depend on the telephone line types.
For end-to-end, loop or ground start and DID trunks, cross connect only the
TIP/RING pair from the Zetron terminal to the phone company block.
For E&M trunks, cross connect the TIP/RING and E/M pairs or directly terminate the
RJ21 jack of the Zetron terminal to the phone company block.
q
4.
Trim any excess wire from each punchdown terminal to ensure good electrical
contact.
q
5.
Label the punchdown block to identify each of the leads. This will simplify
troubleshooting and repair later.
Telco connections for the punchdown block are complete. Proceed to the “RADIO STATION
CONNECTIONS” subsection on page 61.
Telco Phone Jack Interface
In some applications, the telephone interface is provided with standard wall phone jacks (RJ -
type) instead of a punchdown block. This may be the case in a residence or converted office
building.
If wall jacks are available, Zetron recommends using the optional installation interface assembly
described on page 49 that includes the easy-to-install terminal block adapter. However, an
optional RJ66M425 block (Part No. 802-0264) is also available from Zetron for this type of telco
connection. The optional block provides six 8-pin RJ phone jacks for the telco interface.
Figure 24 illustrates the hardware connections between the Model 640 punchdown block and the
RJ66M425 telco block. The block provides six trunks, although the Model 640 only uses a maxi-
mum of four trunks. Notice that the telco line type in the figure is 4-wire E&M. Connections for
each trunk will vary slightly, depending on the signaling type.
Follow the steps below to interface to the optional RJ66M425 block:
q
1.
Power-down the paging terminal.
q
2.
Connect the leads for each Model 640 trunk as shown in Figure 24, using standard 26
AWG wire-wrap wire. Wiring configuration varies by telephone line type (E&M 4-
wire shown in the illustration). Figure 25 compares the pin configurations of the two
RJ-type phone jacks.
Note:
The punchdown terminals on the optional RJ66M425 block do not function electric-
ally like those on the other punchdown blocks described earlier. The four terminals in
each row are separated into TIP and RING connections as shown in Figure 24.
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Страница 197: ...Parts Lists and Schematics 025 9416 185 COMPONENT LOCATIONS Dual Dial Click 702 9119C Dual MF 702 9197D 1...
Страница 198: ...Parts Lists and Schematics 186 025 9416 RAM Disk 702 9386B ROM Disk 702 9389B...
Страница 199: ...Parts Lists and Schematics 025 9416 187 TNPP Interface 702 9362C 2...
Страница 200: ...Parts Lists and Schematics 188 025 9416 Terminal Block Adapter 702 9470B...
Страница 201: ...Parts Lists and Schematics 025 9416 189 CONFIGURATION DIAGRAMS Dual Trunk Telco DID 024 0076A...
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Страница 203: ...Parts Lists and Schematics 025 9416 191 Dual Trunk Telco E M 024 0078A...
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