Black Box Mixed-Media Fiber Hubs
Installation and User Guide (4/99)
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Supports 10 or 100Mbps network connections on each of sixteen ports
LH8050A Dual-Speed Fiber Hubs combine two logical hubs --- one at 10 Mbps and one at
100Mbps --- in one physical box supporting two traffic domains. Each port can operate at either
10 or 100Mbps, independently of the other ports.
Mixed-Media 10 & 100Mbps fiber port types in one unit for maximum flexibility
The LH8050A is configurable with up to 16 economical port modules, and any or all of the
ports may be either 10 or 100Mbps fiber. RJ-45 ports may also be configured, with per-port
selection. Port Modules with all kinds of fiber connector types are supported, making the
LH8050A Fiber Hub ideal for “fiber-to-the-desktop” applications.
Switched port in the rear Bonus Port for a FDX fiber backbone, optional
To segment an LH8050A (or stack) from a connected hub or switch using full-duplex fiber
operating at 100Mbps, an optional SPM is included in some models. This provides distances up
to 2Km (15Km sgl.-m) for the fiber link, and improved performance for the LH8050A’s users.
Stackable and Scaleable Configurations
The LH8050A is equipped with an inter-repeater bus that allows multiple units (one LH8050A
and up to two special LH8050A-C units or two LH8016A-C units) to be stacked, thus
supporting up to 48 ports with all ports operating as a single dual-speed mixed-media repeater.
Auto-sensing for speed, 10 or 100Mbps, on each RJ-45 front port
All RJ-45 front ports support 10/100 auto-negotiation for speed, IEEE802.3u. compliant.
LEDs for Chassis and PM Cards
The LH8050A chassis and each of the 16 front-mounted PM cards are equipped with traffic
activity and segment-status LEDs, conveniently monitored from the front of the unit.
Installation is “Plug and Play”, Operation is Transparent to Software
The LH8050A operates as a hardware switch between domains, only forwarding those packets
from each domain that are needed on the other domain. Internal address tables are self-learning,
enabling users to change port connections or 10 or 100Mbps domains without affecting
operations.
Internal Power Supply, Auto-ranging AC voltage and frequency
An internal universal power supply allows any LH8050A unit to be used with any of the
normal AC power types found around the world.
2.10 Applications
