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T-Tapping
(See Figure 5)
The REP-1 can be connected anywhere
along a network run to provide a T-tap.
Locate the REP-1 between the two ends of
the primary network and do not use an
EOL device where the primary network
connects to the REP-1.
If, however, the tapped side runs in two
directions from the REP-1, do not use an
end of line resistor. Instead, place the
end of line resistors at the two ends of the
tapped network. For Style 7 networks use
the second half of the REP-1 for the B side
of the network. Repeat this method
when connecting the end of line resistors
on the B side of a Style 7 network.
Notes:
1. Use 18 AWG minimum wire.
2. Limit maximum resistance per pair to 80 ohms.
3. Use shielded twisted pair.
4. Terminate the shield ONLY at the MMB enclosure.
5. The wiring is power limited according to NFPA 70
per NEC 760.
6. Maximum voltage is 8V P-P.
Figure 5
T-Tapping in One Direction (Style 4)
6
Converting from Style 7 to Style 4
(See Figure 6)
The REP-1 can be used to provide a Style
4 tap on a Style 7 network. Figure 6 shows
a Style 4 tap that begins at the REP-1. This
tap can also be run in two directions if the
end of line resistors are connected to the
ends of the Style 4 tap. A typical use of this
connection to either an RCC-1/1F or MOI-7
would be for a group of annunciators where
Style 7 wiring is not required for the annun-
ciators, but the rest of the system must be
Style 7. Do not connect the Style 4 tap to
PSR-1s.
7. Maximum current is 150mA.
8. Use the end of line resistor P/N 140-820150 (120
ohms,
1
/
W). See Figure 2D for further information.
4
9. Refer to Wiring Specification for MXL, MXL-IQ
and MXLV Systems, P/N 315-092772 revision 6
or higher, for additional wiring information.
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