Black Box Mixed-Media Fiber Hubs
Installation and User Guide (4/99)
6
2.2 General
Information
Designed for “fiber-to-the-desktop” applications that are economical and high
performance, the LH8050A accepts a variety of fiber modules so that users can choose the fiber
port types desired. A dozen different 100Mbps and 10 Mbps fiber port module types are
supported, and they are normally field configurable.
Rich with configuration options, the LH8050A units support either 10 or 100Mbps
fiber modules per port. A rear bonus port may contain an optional Switch Port Modules for
switched backbone connections. Stacking up to 3 units high (48 ports) is supported with
LH8016A-C Hubs configurable in the stacks. Rack-mounting is standard, and RJ-45 ports
when used are auto-sensing for speed.
2.3
Product Description
The Black Box LH8050A brings you the future of Fiber Optic connectivity. The
LH8050A, based on dual-speed technology, are highly versatile cost-effective Mixed-Media
Fiber hubs that provide the flexibility of configurable fiber and RJ-45 ports, of 10 Mbps or
100Mbps Ethernet speed per hub. Each RJ-45 port is independently auto-sensing for 10/100
speed, adapting to match the speed of the connecting device. These capabilities provide the
ultimate in flexibility for small to medium sized “fiber to desktop” and “fiber-for-security”
networks that are gradually transitioning from 10 Mbps Ethernet to 100Mbps Fast Ethernet.
Sixteen port slots are located on the front of the unit. The product is accommodated in a 1U
rack-mount package.
Combinations of standard Ethernet media types are supported. These include
10BASE-FX, 10BASE-T, 100BASE-FX, 100BASE-TX, and (proposed) 100BASE-SX. The
Black-Box Dual-Speed LH8050A Fiber Hub supports almost all the popular fiber port
connector types, i.e. ST, SC, FC, MT-RJ, and VF-45 in multi-mode or single-mode as
applicable, and can be installed as 100Mbps or 10 Mbps speed (10 Mbps port connector types
are ST, SC and FC only). The LH8050A hubs support two shared traffic domains, one at
100Mbps and one at 10 Mbps, with an internal bridge or switch interconnecting the two
domains. The automatic per-port speed-sensing is continuous, allowing a connected device to
change speed and re-LINK at any time without impairing the operation of the other ports and
connected devices.
The LH8050A is designed with the capability to be stacked with LH8016A-C’s. The
LH8050A units may be configured in a stack with as many as 3 total units. The two shared
traffic domains automatically expand to support all of the ports in the stack. Any combination
of 10 and 100Mbps ports, up to the
maximum 48
ports
(3units) in one stack, can be use at any
