ROC364 Instruction Manual
4-16 Communications Cards Rev Jun/05
The following signals, used only for monitoring or connecting to an analyzer, are available at connector
P7 located at the bottom edge of the card. These signals are normally not active. To activate the signals,
SHUTDOWN (pin 8) must be grounded by connecting a jumper between pin 8 and pin 2. All unused
signals can be left un-terminated.
P7 Terminal Function
1 +5 volts dc
2 COM
3 DCD
4 TXD
5 DTR
6 RTS
7 RXD
8 Shutdown
4.4.4 Leased-Line Modem Communications Card Wiring
The Leased-Line Modem Card interfaces to a leased line through the RJ11 jack. Refer to Section 4.3.1,
Setting Modem Card Jumpers, on page 4-10 for jumper settings (P3, P4, and P5) and Section 4.2.3,
Setting Modem Card Attenuation Levels, on page 4-11 for attenuation resistor (R2) values.
The signals present depend on the mode of operation of the card, either 2-wire or 4-wire.
Operating Mode
RJ11 Terminal
2-Wire 4-Wire
BLK (Not used) Tip2
RED Ring Ring1
GRN Tip Tip1
YEL (Not used) Ring2
NOTE: On the Leased-Line Modem Card, Tip and Ring is shown reversed to comply with
normal telephone signals and functions normally with the two signals reversed.
Figure 4-14 shows the wiring connections to the card.
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