Black Box 4-Port BNC Repeater, Installation And User Manual, Page: 12 / 20

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4-Port BNC Repeater Installation and User Guide
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2.2.1 4-Port BNC Repeater Chassis
The 4-Port BNC Repeater functions as a BNC “hub” repeater. Its chassis houses
the main repeater circuit board, the port connectors and status LEDs, and the power supply.
The BNC ports are used for attaching one Ethernet BNC (or ThinNet) segment each, and
provide full IEEE 802.3 repeater functionality supporting a full length segment. The AUI
port is used for attaching an AUI drop-cable to a ThickNet backbone, or for a mini-
transceiver to enable connecting other media types
Figure 2.2.1: 4-Port BNC Repeater
(Front and Rear Views)
All LEDs for the 4-Port BNC Repeater
unit are front-mounted for easy visual monitoring. The AC power cord port is in the rear.
The internal power supply is auto-ranging to handle any AC power type
worldwide. Power input may range from 90 to 260 vac, with a frequency rating of 47 to 63
Hz. The unit is equipped with a rear mounted IEC-type recessed male AC power connector.
(When shipped for use in areas other than 115 vac, a power cord will not be included). The
unit is convection-cooled for silent operation.
The 4-Port BNC Repeater base unit features Power (PWR), Jabber (JAM) and
ACT (Activity) LED status indicators located in the front of the unit. These common LEDs
provide a visual assessment of the operational condition and aggregate network activity at
the unit, and are in addition to the LEDs on each individual BNC port.
Each BNC port requires a “tee” connector, and has Receive, Collision, Partition
and Manual Partition LEDs. The “partition” function (see “Specifications” for details) is
the standard for Ethernet repeaters, i.e. it indicates the port has been partitioned (separated
and no longer connected to the rest of the ports) in order to isolate a fault. Usually, the fault
is somewhere in the attached BNC cable and its tap or connections. A BNC port that is not
properly terminated will also be partitioned.
The “Manual Partition” pushbutton switch on each BNC port provides a way to
separate or segment a BNC port in order to run network tests or to make repairs on the
attached BNC cable and connections. The manual partition over-rides the auto-partition.
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