Black Box X-25 PAD-2 User Manual

Provides access to a
packet-switched link
for one or two RS-232
devices.

Local channels are
modular, with top
async data rate of

115.2 kbps.

Link channel is sync
and can be either
RS-232 (up to 128 kbps)
or V.35 (up to 2 Mbps).

Can be configured for
a large variety of
applications with
terminal-based menus.

Universal power
supply.

Measures only

0.9"H x 2.1"W x 4.3"D
(2.3 x 5.4 x 11 cm).

T

he X.25 PAD-2 gives one or two

pieces of RS-232 equipment
easy, cost-effective access to a
packet-switching network or
device in a wide range of applica­tions. For example, it can serve as:

• A PAD (Packet Assembler/
Disassembler);

• An access unit for private or
public X.25 networks;

• An access server for a
mainframe’s X.25 ports;

• An async switch and
contention manager; or

• A FRAD (Frame Relay
Access Device).

It can also be used to run
asynchronous data over Frame
Relay, either in X.25 packets or
directly (in SLIP protocol).

Two versions are available:
The V.35 version (product code
MX320A-HS) uses ITU V.35 for its
channel-1 (sync packet-switched)
interface, while the RS-232 model
(MX325A-HS) uses RS-232/V.24.
On all models, channel 1 (hidden
from view in the above illustration)
is a DB25 female connector, while

RESET

CH3

ERROR

POWER

CH2

CH1

SYNC DATA

The most compact way to connect

one or two RS-232 devices to X.25

or Frame Relay.

Key Features

X.25 PAD-2

local async channels 2 and 3 are
RJ-45 female connectors. The
MX320A-HS comes with a short
cable you can attach to the WAN
port to patch it to a V.35-standard
M/34 female connector. The X.25
PAD-2’s maximum data rate on
channel 1 is 128 kbps for the
MX325A-HS or 2 Mbps for the
MX320A-HS.

Channel 1 is always DTE, but
can be configured for either X.25
or Frame Relay. Channels 2 and 3
are always DCE but can be
configured for SLIP or X.28.

The X.25 PAD-2 comes with a
universal 115/230-VAC power
supply, an RJ-45 to DB25 patch
cable for configuration, and a
manual. MX320 models should
also come with a DB25 to M/34
patch cable for the WAN-link port.

In order to connect the PAD-2
to your equipment, you will also
need an RS-232 or V.35 cable for
channel 1, plus either (a) another
special cable like the configuration
cable or (b) one or two twisted­pair cables with modular adapters
for channels 2 and 3.

Except for a single internal
jumper that controls whether or
not the X.25 PAD-2 resets itself to
factory defaults when it powers
up, you’ll configure the PAD-2
with a powerful terminal-based
menu system . Just use the
included configuration cable to
attach the unit to a terminal or a
PC running a terminal emulator,
and you can tailor the PAD-2 for
the requirements of almost any
packet-switched application. The
configuration firmware is covered
in our “Packet Switching Guide”;
if you don’t already have a copy,
ask for one when you order.

The X.25 PAD-2 can also be
monitored through its firmware,
but it has six top-mounted LEDs
that show you basic operating
information at a glance: POWER,
ERROR, SYNC, and three activity
LEDs (one for each channel).

Although you should never
have to do so, you can press the
X.25 PAD-2’s RESET button to
reset its internal circuitry and
start its power-up self-test.

Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: [e-mail]

© 2000. All rights reserved.

Black Box Corporation.

12/8/2000 #25120

Compliance: CE (EN55022,

EN 50082-1, EN 60950) Class A;
FCC Class A, IC Class/classe A

Interfaces:

Channel 1 (to packet-switched

synchronous link):
MX320A-HS: ITU V.35

proprietarily pinned on
DB25, DTE;

MX325A-HS: EIA/TIA RS-232/

ITU V.24/V.28, DTE;

Channels 2 and 3 (to local async

devices): EIA/TIA RS-232/
ITU V.24/V.28 proprietarily
pinned on RJ-45, DCE

Protocols:

Channel 1: Synchronous 1988

ITU X.25 LAP-B or Frame
Relay; for Frame Relay,
supports CCLM, LMI, and
ANSI PVC management
protocols, as well as ANSI
T1.606, T1.617 Annex D, T1.618,
and ITU Q.922 Annex A;

Channels 2 and 3: Asynchronous

SLIP or X.28 (user-selectable)

Clock Source: Channel 1: Internal or

external for receive and transmit
paths, user-selectable

Data Rate:

Channel 1:

MX320A-HS: Up to 2 Mbps,

user-selectable;

MX325A-HS: Up to 128 kbps,

user-selectable;

Channels 2 and 3: 75 bps to

115.2 kbps, user-selectable

Data Format: Channels 2 and 3: 5, 6,

7, or 8 data bits; even, odd, mark,
space, or no parity; 1, 1.5, or
2 stop bits; user-selectable

Flow Control: Channels 2 and 3:

Hardware (DTR/CTS) or software
(X-ON/X-OFF), user-selectable

Other Characteristics for

Channels 2 and 3:

Log-on messages: Herald and

bulletin, user-definable;

Command modes: ITU X.28 (with

proprietary extensions) and
X.29;

Terminal handling: Enhanced,

beyond the requirements of
ITU X.3

Packet Size: Up to 4 KB for X.25 or

8 KB for Frame Relay

Maximum Distance:

Up to 50 ft. (15.2 m) to attached

devices;

MX320A-HS: If unbalanced

control leads aren’t required,
transmission across 500 ft.
(152.4 m) or more might be
possible to/from Channel 1
only

Memory: 512 KB RAM

User Controls:

Top-mounted reset button;
(1) Internal board-mounted

jumper for power-up settings

Indicators: (6) Top-mounted LEDs:

(1) POWER (lights green while

unit is powered);

(1) ERROR (lights red if a

hardware malfunction is
detected);

(1) SYNC (lights or flashes green

to show status of
synchronization between
linked PAD-2s);

(3) DATA (one for each

channel—these light or flash
yellow in response to data
activity on the corresponding
port)

Connectors:

(1) Left-side-mounted DB25

female for channel 1 (patch
cable provided to M/34 female
on MX320 models);

(2) Right-side-mounted RJ-45

female for channels 2 and 3;

(1) Front-mounted barrel jack for

power

Temperature Tolerance: 32 to 122˚F

(0 to 50˚C)

Humidity Tolerance: Up to 90%

noncondensing

Power:

Through desktop power supply:

Input: 100 to 250 VAC, 47 to

63 Hz (autosensing), at
approximately 300 mA;

Output: 5 VDC at up to 1.5 A;

Consumption: 3.5 watts maximum

Size: 0.9"H x 2.1"W x 4.3"D

(2.3 x 5.4 x 11 cm)

Weight: 3.3 oz. (90 g)

Mainframe or

server

X.25

PAD-2

X.25

PAD-2

Frame

Relay

CSU/DSU

CSU/DSU

Back-office

PC

Serial POS

terminal

Specifications

Ordering Information

ITEM CODE

X.25 PAD-2

V.35 .....................................................................MX320A-HS

RS-232................................................................MX325A-HS

Y

ou might also need:

CSU/DSU MS ........................................................MT132A-R2

V.35 Cable, M/34 M/M (specify length).........EYN450-MM

RS-232 Cable (specify length)

DB25 M/F..........................................................ECM25C-MF

DB25 M/M......................................................ECM25C-MM

CAT5 unshielded twisted-pair cable, RJ-45 M/M,

specify length...........................................EYN737MS-MM

8-Wire Modular Adapter Kits (unassembled)

RJ-45 F↔DB9 F...........................................................FA065

RJ-45 F↔DB25 F.........................................................FA027

RJ-45 F↔DB25 M.......................................................FA025

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industry— Fido Protection

®

. For more information,

request FaxBack 22512.

Hook all of your
satellite locations—
no matter how small
they are—into your
X.25 or Frame Relay
network.