Black Box 38892-R2, 38888-R2, 38890-R2 Specifications

Support up to 4, 8, or 16 channels over

fiber optic cable in limited-distance applications.

Support up to 4, 8, or 16 channels over

fiber optic cable in limited-distance applications.

4-, 8-, and 16-Port Fiber Optic Muxes

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FEA TURES

• Fiber optic multiplexor and line driver
in one compact unit.

• Ideal for limited-distance applications.

• Easy to install—no option switches to
set.

• Transparent to speed and protocol.

• Operates at distances up to 10,000 feet
(3048 m) over duplex multimode fiber
optic cable.

• Supports software (X-ON/X-OFF)
flow control.

Use the multimode fiber optic cable in your small-to-medium-sized campus

to connect 16 PCs to an async host up to 10,000 ft. (3048 m) away

with the 16-Port Fiber Optic Mux.

OVERVIEW

Why buy a mux and a line driver separately when you can
get both in one convenient package. If you have fiber optic
cable installed in your small-to-medium-sized campus,
consider our 4-, 8-, or 16-Port Async Local Fiber Optic RS-232
Muxes.

These async time-division multiplexors support up to 4,
8, or 16 channels at speeds up to 19.2 kbps (38890-R2 or
38892-R2) or 64 kbps (38888-R2). And the integral line driver
for duplex multimode fiber gives you point-to-point
communications over short distances (up to 10,000 feet
[3048 m]).

Compared to statistical multiplexors and leased-line
modems, the TDM (Time-Division Multiplexor) and line-driver
combination offers a couple of advantages for limited­distance applications:

• Although SPM (Statistical Packet Multiplexing) is very
efficient, it’s also much more expensive than TDM.
If you have limited distances to carry data, the fixed
bandwidth used by TDMs gets you more for your money.

• Leased-line modems are not used between devices in
the same building or close to each other. To send data
a short distance over private, point-to-point fiber optic
cable systems, you’d typically use a line driver.

Synchronization between Asynchronous Local RS-232
Muxes is maintained continuously with no operator control
required. A Sync Loss indicator on the front of the unit alerts
you if loss of sync occurs.

These muxes automatically adapt port speeds to the rates
of the individual terminals, without requiring a clock source.
All ports operate at maximum throughput levels with virtually
no multiplexing delay. As DTEspeeds vary, high-speed
data sampling on each port makes the unit transparent to
error control, EIA signal propagation, or flow control.

16-Port Fiber Optic Mux

(38892-R2)

Async Host

PCs

16-Port Fiber Optic Mux

(38892-R2)

PCs