Black Box MX321A-35-D48-R2, MX321AE-232-R3, MX321A-36-R2, MX321A-530-R2, MX320A-HS Specifications

Connect as many as eight asynchronous users to

another site’s resources using X.25 or Frame Relay.

Connect as many as eight asynchronous users to

another site’s resources using X.25 or Frame Relay.

X.25 PAD-8 and X.25 2-Channel FRAD

© 2007. All rights reserved. Black Box Corporation.

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FEATURES

• Supports SNMP, SLIP, X.32, IP routing,
Frame Relay for RFC 1490, X.21 for RFC
1490 and 1356, and X.25 multicasting.

• Supports Frame Relay and X.25 packet
switching—ideal for migrating
networks.

• Built-in management agent for
configuring channels.

• 8-port model: channel async up to

115.2 kbps, composite sync up to
2 Mbps.

• 2-port model: channel async up to

115.2 kbps, channel sync up to 128 kbps,
composite sync up to 2 Mbps.

Connect your async devices with packet switching!

OVERVIEW

If you have X.25 or Frame Relay service, why not make
the most of it? Use our X.25 PAD-8 to weave the data from
as many as eight asynchronous devices into a single stream
for transmission on a high-speed synchronous channel!
Or for smaller, Frame Relay installations, choose the X.25
2-Channel FRAD.

X.25 PAD-8

The 8-port packet assembler/disassembler (PAD) converts
async channel data into X.25 data packets and concentrates
the packetized data stream onto a single X.25 link via a
composite sync interface. Packets received over the X.25 link
are converted back into the async format.

Supporting both switched and permanent virtual circuits
(PVCs), the X.25 PAD-8 works in a wide range of applications
and can function as:

• An access unit to X.25 private or public networks.

• An access server to X.25 ports of mainframes.

• A Frame Relay access device (FRAD) to run async data
in X.25 packets over Frame Relay.

• A FRAD to run async data (using a protocol like SLIP)
directly over Frame Relay.

Async port connections

The X.25 PAD-8’s async ports are RS-232, pinned out on
RJ-45. Configure each of them for a data rate from 75 bps
to 115.2 kbps. It’s very easy to run modular twisted-pair cable
from these ports to any of your async RS-232 devices: PCs,

terminals, or serial printers. We offer several types of modular
adapters that you can use to attach the cable to any of these
devices.

Sync port connections

The single sync port for the connected main link can
handle data rates as high as 2 Mbps. Different models of the
X.25 PAD-8 come with different sync-port interfaces. Several
models offer variations of power sources. We offer, for
instance, RS-232 and V.35 models with a choice of 230-VAC or

-48-VDC input. Our RS-422/RS-449 and RS-422/RS-530 models
are available with 115-VAC power input only.

The DC models accept -48 VDC; for a +24 VDC model, call
our FREE Tech Support. The -48 and +24 VDC models come
with a mating connector that you can splice onto the end of
your DC power cord.

Order a model that will work with your WAN-access
device: a sync modem, CSU/DSU, FRAD, etc.

Controlling the PAD

You can control the X.25 PAD-8 through a sophisticated
terminal-based menu system. (It has extended X.28/X.29 or
SLIP command modes and performs extended X.3 terminal
handling.)

The built-in management agent not only enables you to
configure the system but also to compile status reports and
statistics. Plus the X.25 PAD-8 incorporates an SNMP agent.

Local Site

Remote Site

LAN

LAN

Terminals

Admin

PC

Async Router

(To Remote Host)(To Remote Router)

X.25 PAD-8

Sync Modem,
CSU/DSU, etc.

X.25 or Frame

Relay

Sync Modem,
CSU/DSU, etc.

X.25 PAD-8

(To Terminals)

(To Admin

PC)

(To Admin PC)

(To Local Router)

Async

Host

Async Router

LAN

LAN

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Using the menu system, first configure the async channels
to set profiles, sync link, and system parameters. Then use any
of the X.25 PAD-8’s powerful features for your system:

• PVCs.

• Call IDs.

• NUI databases.

• Aliasing.

• IP routing and routing tables.

• Frame Relay funneling.

• X.32 (XID) tables.

• SNMP management and event reporting.

• X.25 multicasting.

The X.25 PAD-8’s circuit board contains two jumpers for
initial configuration purposes and a 68302 CPU that runs the
X.25 PAD-8 software. In most instances, the device operates
unattended. And although its jumpers’ default settings suit
most applications, you can change them to adapt to your
unique operating requirements.

During normal operation, the device’s front-panel Power,
Synchronization, and Main Link LEDs light continuously.
Channel-activity indicators blink according to the traffic load
and turn off when their respective channels are idle.

The X.25 PAD-8’s configuration stores in nonvolatile
memory, so it’s not affected by a power loss. And because the
X.25 PAD-8 has flash memory, you can keep upgrading it—
with even more features—for as long as we keep releasing
new firmware revisions.

If you want to rackmount the X.25 PAD-8, we offer a
Universal Rackmount Kit (RM516) that you can use different
pieces from to either mount a single unit in a 19" rack or
mount two units side-by-side.

X.25 2-Channel FRAD

For smaller installations, choose the X.25 2-Channel FRAD.
It links two async or sync RJ-45 channels to an X.25 or Frame
Relay network via (2) RJ-45 connectors and (1) V.35 (DB25 M)
connector. A DB25 F to M/34 F cable is included.

Integral management configures and monitors both
channels.

TECH SPECS

Async Channel Command Modes — ITU-T Rec. X.28 and proprietary

extensions, ITU-T Rec. X.29

Async Channel Flow Control — X-ON/X-OFF or RTS/CTS flow control

(user-selectable)

Async Channel Log-On Messages — Herald and bulletin (user-definable)
Async Channel Terminal Handling — Enhanced, handling beyond

ITU-T Rec. X.3 requirements

Clocking — X.25 PAD-8: X.25 port: Internal or external;

X.25 2-Channel FRAD: External

Memory — 512 KB RAM
Packet Size — Up to 4096 bytes for X.25; up to 8192 bytes for other

protocols

Protocol — Packet switching: ITU X.25 LAPB or Frame Relay;

Supporting protocols: ITU X.3, X.28, X.29, X.32; LMI, ANSI PVC

management; ANSI T1.606, T1.617 Annex D, T1.618, ITU Q.922
Annex A

Speed — X.25 PAD-8: Async: up to 115.2 kbps;

Composite: Sync up to 2 Mbps;

X.25 2-Channel FRAD: All: Async up to 115.2 kbps, sync RS-232

up to 128 kbps;

MX320A-HS, MX320AE-HS also: Sync V.35 up to 2 Mbps

Throughput — 500 packets per second
Interface — X.25 PAD-8: RS-232, V.35, RS-422 or RS-530;

X.25 2-Channel FRAD: MX320A-HS, MX320AE-HS: V.35;

MX325A-HS, MX325AE-HS: RS-232

Connectors —

X.25 PAD-8: Channels: (8) RJ-45;

Composite: (1) depending on model;

RS-232, RS-530: DB25 F; V.35: M/34 F;

RS-422: DB37 F, via adapter cable;

X.25 2-Channel FRAD: Channels: (2) RJ-45;

Composite: (1) depending on model: RS-232: DB25 M;

V.35: (1) DB25 M with DB25 F to M/34 F cable

Indicators — (14) front-mounted LEDs: (1) Power, (1) Main Link, (1) Error,

(8) Subchannels, (1) Overflow, (1) Test, (1) Synchronization,

Temperature Tolerance — 32 to 122°F (0 to 50°C)
Humidity Tolerance — Up to 90%, noncondensing
Power — X.25 PAD-8: 115 VAC, 60 Hz; 230 VAC, 50 Hz; or -48 VDC;

X.25 2-Channel FRAD: 115 VAC, 60 Hz or 230 VAC, 50 Hz

Size — X.25 PAD-8: 1.7"H x 8.5"W x 9.5"D (4.3 x 21.6 x 24.1 cm);

X.25 2-Channel FRAD: 0.9"H x 4.3"W x 2.1"D (2.3 x 10.9 x 5.3 cm)

Weight — X.25 PAD-8: 3.9 lb. (1.8 kg);

X.25 2-Channel FRAD: 0.2 lb. (0.1 kg)

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• A CSU/DSU, sync modem, or other WAN access device

• A Universal Rackmount Kit (RM516)

• Power-line and data-line surge protectors

724-746-5500 blackbox.com

Item Code

To connect eight channels to Frame Relay, order…

X.25 PAD-8

RS-232

230-VAC MX321AE-232-R3

-48-VDC MX321A-232-D48-R2

V.35

230-VAC MX321AE-35-R2

-48-VDC MX321A-35-D48-R2

RS-422/RS-449

115-VAC MX321A-36-R2

RS-422/RS-530

115-VAC MX321A-530-R2

To connect two channels to Frame Relay, order…

X.25 2-Channel FRAD

V.35

115-VAC MX320A-HS
230-VAC MX320AE-HS

RS-232

115-VAC MX325A-HS
230-VAC MX325AE-HS

To rackmount a single X.25 PAD-8 or two units side-by-side,
order…

Universal Rackmount Kit RM516

✦

Includes (2) short brackets, (1) long bracket, (2) small
U-brackets, and a set of (8) screws and washers.

You may also want to order cables…

For RS-232 interface:

RS-232 Cable, 25-Conductor, 10-ft., (3-m),

Male/Female ECM25T-0010-MF

For V.35 interface:

V.35 Interface Cable, 10-ft., (3-m),

Male/Male EYNT450-0010-MM

For RS-422 interface:

DB37 Interface Cable, 10-ft., (3-m),

Male/Male EDN37T-0010-MM

For RS-530 interface:

RS-530 Data Cable, 10-ft., (3-m),

Male/Female EVNT530-0010-MF

NOTE: For other lengths or genders, call our FREE Tech Support.

YOU MAY ALSO NEED

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• You wait more than 30 minutes to get through
to a vendor’s tech support.

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• It’s 9 p. m. and you need help, but your vendor’s
tech support line is closed.

According to a survey by Data Communications
magazine, 90% of network managers surveyed say
that getting the technical support they need is extremely
important when choosing a vendor. But even though
network managers pay anywhere from 10 to 20% of their
overall purchase price for a basic service and support
contract, the technical support and service they receive
falls far short of their expectations— and certainly isn’t
worth what they paid.

At Black Box, we guarantee the best value and the
best support. You can even consult our Technical Support
Experts before you buy if you need help selecting just
the right component for your application.

Don’t waste time and money— call Black Box today.

Why Buy From Black Box?
Exceptional Value. Exceptional
Tech Support. Period.

MX325A-HS