The Modem-to-Modem Line Cables and Connectors:
The Mini Driver MP Card's line ports are always the upper two ports on its interface module. They are 8-pin RJ-45 connectors, pinned for a standard telco-wiring environment, as shown below. The Mini
Driver MP Card operates full duplex over four wires (two twisted pairs). In all applications, the twisted-pair wire must be 26 AWG or thicker, unconditioned, dry, and metallic. Both shielded and unshielded
cable yield favorable results.
NOTE:
The Mini Driver MP Card can only communicate in a closed data circuit with another
Mini Driver MP Card. It will not work with dialup analog circuits, such as those used
with standard modems.
The Modem-to-modem cable connection must be specially cross-pinned. If your cabling includes punchdown blocks, you can easily do the cross-pinning at a punchdown block. If you will be running cable
directly between two Mini Driver MP Cards, you can get a custom cable from your supplier as a special quote, or you can use regular straight-through-pinned cable and repin one of the RJ connectors (that
is, rearrange the wiring connections between the terminal block and the actual contacts). You might need special crimping tools or new connectors; call Black Box for these items, or for Technical Support if
you have difficulty.
Line Cable Pinouts:
SIGNAL PIN #
PIN #
SIGNAL
N/C
1
8
N/C
GND
2
7
GND
RCV-
3
5
XMT-
XMT+
4
6
RCV+
XMT-
5
3
RCV-
RCV+
6
4
XMT+
GND
7
2
GND
N/C
8
1
N/C
MULTIPOINT APPLICATIONS:
The Mini Driver MP Card supports multipoint applications. Maximum distance between the units will vary based on the number of drops, data rate, wire gauge, etc. Call Black Box Technical Support for
distance estimates more specific to your application. The wiring diagrams on the next page shows how to wire two-pair cables for a Mini Driver MP Card network. (We do not recommend using single-pair
cables for multipoint applications, nor do we recommend arranging multipoint equipment in a star topology.
OPERATION:
Once you have configured each Mini Driver MP Card and connected the cables, you are ready to operate the units. The Mini Driver MP Card features 13 front-panel status LED's that indicate the condition of
the modem and the communication link.
The Card will steadily light its green "PWR" LED as long as it is receiving power through its mid-plane MicroRack connection.
The green "TD" and "RD" LED's blink to show positive-state data activity. The red "TD" and "RD" LED's blink to show negative-state data activity. If the red "TD" and "RD" LED's are steadily lit, the
modem-to-modem connection for that unit is idle.
If position 1 of switch S1 and S3 on the main module is set to OFF (carrier is set to "always on"), the green "CD" LED for the corresponding modem will always be lit. If S1-1 or S3-1 on the main
module is set to ON (carrier is set to "controlled by RTS"), the Card will raise CD to the DTE and light the green "CD" LED for the corresponding modem when carrier is present, or lower CD
to the DTE and light the red "CD" LED when carrier is absent or low.
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