Black Box 38892-R2 User manual

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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FEATURES

• 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 limited-

distance 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 DTE speeds 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

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TECH SPECS

Maximum Distance — 10,000 ft. (3048 m) over duplex multimode fiber

Multiplexing Technique — Time-division

Operation — Full duplex

Protocol — Async

Speed — 38892-R2, 38890-R2: 19.2 kbps;

38888-R2: 64 kbps

Interface — Channel: RS-232;

Composite: Dual ST®

Connectors — Composite: All: (2) ST;

Channel: 38888-R2: (4) RJ-45;

38890-R2: (8) RJ-45;

38892-R2: (16) RJ-45

Indicators — (3) LEDs: Power, Composite Data, Sync Loss

Power — 115-VAC, 60-Hz external power supply

Size — 38888-R2, 38890-R2: 1.7"H x 7"W x 5.3"D (4.3 x 17.8 x 13.5 cm);

38892-R2: 2.2"H x 7"W x 5.3"D (5.6 x 17.8 x 13.5 cm)

Weight — 38888-R2, 38890-R2: 2 lb. (0.9 kg);

38892-R2: 2.5 lb. (1.1 kg)

Item Code

Async Local Fiber Optic RS-232 Multiplexor

4-Port 38888-R2

8-Port 38890-R2

16-Port 38892-R2

Optional accessories include…

Telephone Bulk Cable EL08A

Fiber Optic Duplex Bulk Cable EXN062A

Modular Adapters

DB25 Male/RJ-45 for DTE 523951

DB9 Female/RJ-45 for DTE 523953

DB25 Female/RJ-45 for DTE 523954

DB25 Male/RJ-45 for DCE 523952

Time-division multiplexing.

TDM operates by dividing the available bandwidth into

fixed-duration segments. Each segment or channel is assigned

to a user and is given its own time slot to access the network.

First, information from Channel A is transmitted, then

information from Channel B, and so on in a regular sequence,

continually cycling back to Channel A. Bandwidth allocation is

static: Each channel receives a fixed amount of bandwidth,

preset by the network administrator.

TDM is a relatively inexpensive multiplexing technique and

is simple to implement, so it has typically been the first

multiplexing technique applied to any new high-speed

bandwidth service at first offerings. TDM introduces very little

signal delay, so it’s well suited to transport data, voice, and

video traffic, provided enough bandwidth is available.

The figure on page 2 shows a mux merging 16 data

channels over dual fiber optic cable. Each data channel can

achieve speeds of up to 19.2 kbps with the 38892-R2 or 38890-

R2, 64 kbps with the 38888-R2.

Technically Speaking

38892-R2

Why choose fiber?

Fiber optic cable offers several clear advantages over

twisted-pair:

• Using fiber completely eliminates the potential for

ground loops and electrical problems like crosstalk

(interference from an adjacent communication

channel).

• With fiber you also get more bandwidth and speed, as

well as longer distances, which means more data goes

farther faster.

Technically Speaking

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