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BLACK BOX
4-Port BNC Repeater Installation and User Guide
4.0
OPERATION
This section describes the functionality and operation of the 4-Port BNC
Repeater.
4.1
Repeater Functionality
The 4-Port BNC Repeater operates as a "BNC hub". It is compliant with IEEE
802.3 specifications and supports all applicable IEEE media. The following describes the
basic functionality of the 4-Port BNC Repeaters.
1. Repeater Functions: Each port operates in conjunction with the controller
functions of the 4-Port BNC Repeater base unit, functioning together as a fully
compliant Ethernet repeater. Each 4-Port BNC Repeater unit counts as a single
repeater in network topology design..
2. Collisions: When a collision is detected at a port other than the original
receiving port, it generates a jam pattern to the other ports. When a collision
signal is detected at a receiving port, it generates a jam pattern to the other port.
The sequence of jam signals depends on the sequence and location of collisions.
3. Partitioning and Re-connection: A 4-Port BNC Repeater will automatically
disconnect (partition) any segment (port) when 64 consecutive collisions occur or
after 6.5 ms of continuous transmissions. Network integrity is checked every 800
ms and segment (port) reconnection occurs after a 512-bit packet is transmitted
without error.
The Manual Partition function (MAN PAR PUSHBUTTON SWITCH)
over-rides standard partitioning and re-connection logic. See "Features and
Benefits" and Section 4.4 for discussions and explanations on this topic.
4.2
Powering the 4-Port BNC Repeater
The 4-Port BNC Repeater incorporates an internal universal power supply, and
has a recessed male IEC connector for the AC power cord at the right-rear. A six foot
power cord is supplied with each unit; it works with 115vac power outlets only.
The 4-Port BNC Repeater's auto-ranging power supply supports installation
environments where the AC voltage is from 90 to 260 volts with a power input frequency
between 47 and 63 Hz, and will consume no more than a maximum of 20 watts. The power
connector is located on the back of the unit. In order to power down the unit, simply
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