© Copyright 1997. All rights reserved. Black Box Corporation. 4-Port BNC Repeater Our compact, low-cost ThinNet workgroup repeater. 4-Port BNC Repeater ACT ACT ACT TERM I AUI TERM O PART Key Features Ethernet/IEEE 802.3, 10BASE2 and 10BASE5 compliant. Connects Thicknet and ThinNet segments on one unit. User-selectable port termination. Provides internal network-management functions. Preamble regeneration, signal retiming/restoration, extension of fragmented packets, and automatic partitioning/re-enable. 18605 ACT I PART TERM O PART I COL PWR TERM O PART Overview T ACT he 4-Port BNC Repeater is a compact, low-cost 4-port ThinNet Repeater that is fully compliant with Ethernet/IEEE 802.3 standards. The small size of this repeater makes it particularly well-suited for PC workgroups. All of the ports are functionally equivalent and can be used for the direct connection of the devices with Ethernet interfaces. Each BNC port has switchselectable 50-ohm termination that eliminates the need for an external T-connector and allows for a star hub configuration. The per-port LED display indicates activity and partition status for individual segment monitoring. The AUI port offers additional interfacing capability. Accompanying I O PART LEDs indicate activity of a DCE device via this port plus the enabling of automatic partitioning. The internal networkmanagement functions constantly monitor each port for signal quality and will automatically disconnect a device that produces noise or excessive collisions. The device will automatically be reconnected when the error condition is cleared. The integrity and signal quality of the connected segments are also actively monitored internally. Whenever a collision is detected on a port, the repeater generates a 96-bit jam packet which is subsequently transmitted to all other ports on the segment. The repeater completely retimes and restores the full- amplitude wave form for each retransmitted packet. A fulllength preamble is also generated. This ensures packet integrity across the total network. Packets which exceed the maximum legal length for Ethernet/IEEE 802.3 packets are automatically truncated. This prevents a device from blocking the network by transmitting a continuous data stream or extra-long packet. The small size, low power consumption, elimination of moving parts, and environmental constraints permits the unit to be installed in a normal office environment. The unit is selfconfiguring, and no installation tools are required. 1. The diagram to the right shows the 4-Port BNC Repeater in a typical application. Thicknet backbone AUI cable Thick Transceiver (LE003A) 4-Port BNC Repeater The illustration below identifies the Repeater’s components. ThinNet cable up to 29 stations per segment ThinNet cable up to 29 stations per segment ThinNet cable up to 29 stations per segment ThinNet BNC connector with Activity and Partition LEDs 15-pin D-type female connector with Activity and Partition LEDs ThinNet cable up to 29 stations per segment Unit Power and Collision LEDs 4-Port BNC Repeater ACT ACT ACT TERM I AUI PART ACT TERM O I PART ACT TERM O I P ART COL PWR I PART O PART Termination switch Specifications Maximum Segment Length — ThinNet (BNC): 185 metres (607 feet); Thicknet (AUI): 50 metres(164 feet ) Connectors — ThinNet (BNC): Four BNC receptacles for use with RG-58 ThinNet cable; Thicknet (AUI): One 15pin D-type female connector with slide latch LED Indicators — (1) Power, (1) Collision, (4) Activity, (4) Partition AC IN 90-260V 50/60Hz 0.5A TERM O Power Approvals — UL , cUL, CE, VCCI, FCC Class A ® MTBF — 156,258 hours Operating Temperature — 0 to 55°C (32 to 131°F) For these and other components... Call our expert Technical Support Staff for all your LAN needs. They’ll help you find the best equipment for your application. Storage Temperature — -20 to +70°C (-4 to +158°F) Relative Humidity Tolerance — 5 to 90%, noncondensing Power — 20W maximum, 90–250 VAC, 50–60 Hz Size — 4.3 x 17 x 22.6 cm (1.7"H x 6.7"W x 8.9"D) Ordering Information This information will help you place your order quickly. PRODUCT NAME ORDER CODE 4-Port BNC Repeater..............................................LE8003A-R2 Weight — 1.4 kg (3 lb.) 18605 2.
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