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Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: info@blackbox.com
© 2003. All rights reserved.
Black Box Corporation.
10/27/2003 #21470
Attach a single local
device to, or multiplex
two devices onto, a
packet-switched WAN
such as X.25 or Frame
Relay.
Available in versions
with RS-232, RS-530,
V.35, or X.21 main-link
ports, as well as
versions with a DDS
WAN port.
Aggregate sync data
rates (total for all sync
ports) up to 2 Mbps,
per-port async rates
up to 115.2 kbps.
Control and configure
it from a terminal for
almost any packetswitching application.
Firmware is flashupgradable.
Rackmountable.
M
aybe you’re thinking about
moving to packet-switched
technology to get your data across
the country or around the world—
straight Frame Relay or X.25,
perhaps, or HDLC or IP/SLIP over
one or the other. But where can
you find an access device that’s
versatile yet economical enough
for your application? Try the Frame
Relay Access Device Switch-3 A/S
(Fradswitch-3 A/S), 3-Port.
Even though we call it a
“fradswitch,” it doesn’t switch
WAN access, it multiplexes it.
You can attach local devices to
two of its three main-link ports,
then hook the third port into the
packet-switched network either
directly (with “-DDS” models) or
indirectly through a CSU/DSU,
modem, etc. (with other models).
What kind of interfaces do
your local devices have? We
offer models with different mainlink port serial interfaces (RS-232,
RS-530, V.35, or X.21). The “-DDS”
models even have a built-in
CSU/DSU and an RJ-48 DDS
WAN port.
The main-link ports that you
configure as synchronous can
Link two devices with others
across a packet-switched
network—almost any two
devices, almost any packet-
switched protocol!
Key Features
FRAME RELAY ACCESS SWITCH-3 A/S,3-PORT
send and receive data at a total
aggregate data rate of 2 Mbps.
What this means is, when you
add up the data rates of the sync
main-link ports on the Fradswitch3 A/S, they can total as much as
2 Mbps. Any main-link port you
configure as async can transmit
data at up to 115.2 kbps.
The Fradswitch-3 A/S, 3-Port
does have a few internal jumpers,
notably jumper banks that you
can use to determine whether
the main-link ports are DTE or
DCE. However, its main controls—
the ones you can use to control,
monitor, and troubleshoot the unit,
not to mention configure it for
an amazing variety of packetswitching applications—are
embedded in its powerful
firmware. Just attach a terminal
or terminal-emulating PC to its
control port in order to access
the unit’s powerful menu system.
Once installed and configured,
the Fradswitch-3 A/S, 3-Port
usually operates unattended. After
initial setup, operator intervention
is typically only required when the
switch has to be reconfigured.
The switch stores its
configuration in nonvolatile RAM
(NVRAM), so it won’t lose its
configuration if it loses power.
And you can flash-upgrade the
firmware as new versions become
available.
Monitor activity by glancing at
the front-panel indicators. During
normal operation, the switch’s
PWR and SYNC LEDs continuously
light. Channel- and link-activity
LEDs flash according to the traffic
load and darken when the
respective channels are idle.
You also get a Packet
Switching Guide with the switch.
It has system-configuration and
troubleshooting information
(including testing and diagnostics
instructions).
Delivered completely
assembled, the Fradswitch-3 A/S,
3-Port can be installed as a
desktop unit or mounted in a 19"
rack—it takes up just 1U (1.75",
4.4 cm) of vertical space. To install
it in a rack, order the Rackmount
Kit (LRRACK), which includes
brackets and hardware for the
two front holes on the switch’s
side.
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Main-Link Ports
(All Numbered Ports Except
Port 1 on “-DDS” Models)
Clock Source: Internal or recovered
(user-selectable)
Data Rate: Any port configured as
synchronous:
Any data rate that, when
added to the data rates of all
other synchronous main-link
ports, does not total more than
2 Mbps;
Any port configured as
asynchronous:
115,200, 57,600, 38,400, 19,200,
9600, 4800, 1200, 600, 300, 150,
110, or 75 bps
(user-selectable)
Distance (Maximum): Standard
maximum for each interface
Interfaces: Models with “232” in
their product code: EIA/TIA
RS-232 (ITU-T V.24/V.28);
Models with “530” in their
product code: EIA/TIA RS-530;
Models with “V35” in their
product code: ITU-T V.35;
Models with “X21” in their
product code: ITU-T X.21;
All either DTE or DCE
(user-selectable)
Packet Size: X.25: Up to 4096 bytes;
Other protocols: Up to 8192 bytes
Protocols: X.25, Frame Relay, HDLC,
STM (proprietary), IP/SLIP, or
async (user-selectable):
X.25: Complies with ITU-T X.25
(1988), LAP-B;
Frame Relay: Complies with
ANSI T1.606, T1.617
Annex D, and T1.618, as
well as ITU-T Q.922
Annex A; also supports
CLLM, LMI, and ANSI PVC
management protocols;
Specifications
Multiplex I/O to or from two sources at each local site across X.25, Frame Relay,
or packet-switched Internet links for fast, economical WAN datacomm.
Non-secure
LAN
Secure
LAN
Server
Router
CSU/DSU CSU/DSU
Fradswitch-3 A/S
Fradswitch-3
A/S
Host
Firewall
Frame
Relay
STM: Compatible with Stat-4
(MX864A), Stat-8 (MX866A),
and Stat-24 (MX868A)
statistical multiplexors;
IP: Supports encapsulation
over X.25 (as per RFC 1356)
or Frame Relay (as per RFC
1490), as well as dialup links
for X.25 with X.32 protocols
Connectors:
On rear panel: (2) DB25 F (“-DDS”
models) or (3) DB25 F (all
other models);
On adapter cables:
For each V.35 port: (1) M/34 F;
For each X.21 port: (1) DB15 F
DDS Port
(Port 1 on “-DDS” Models Only)
Attenuation: Up to 43 dB
Clock Source: Either internal
(transmit) or recovered from line
signal (receive), user-selectable
Data Rate: 4.8, 9.6, 19.2, or 56 kbps
(user-selectable)
Distance (Maximum):
Over 24 AWG (0.6-mm) wire:
6.5 mi. (10.5 km) at 9.6 kbps,
5 mi. (8 km) at 19.2 kbps, or
4 mi. (6.4 km) at 56 kbps
Interface: Digital Data Service
(DDS) as per AT&T
®
Pub. 62310
Received BPV Sequence: Out of
service (OOS), out of frame
(OOF), DSU loopback
Transmit BPV Sequence: Zero
suppression
Connector: (1) rear-mounted RJ-48 F
Control Port
Command Modes: X.28, extended
Data Rate: 38,400, 19,200, 9600, 4800,
1200, 600, 300, 150, 110, or 75 bps
(user-selectable)
Distance (Maximum): 50 ft. (15.2 m)
Flow Control: Hardware (RTS/CTS)
or software (X-ON/X-OFF), userselectable
Terminal Handling:
Enhanced asynchronous
(exceeds X.3 requirements)
Connector: (1) front-mounted
RJ-45 F
The Unit As a Whole
Compliance: CE, FCC Part 15
Subpart B Class A, DOC
Class/MDC classe A
User Controls: (1) front-mounted
recessed reset pushbutton;
(1) internal jumper for power-up
configuration loading;
(3) internal jumper banks for DTE
vs. DCE;
“-X21” models only: (3) additional
jumpers for DTE vs. DCE;
Firmware-resident terminal-
based configuration menus
Indicators: (11) front-mounted LEDs:
PWR (unit power); ERR (error);
OVF (buffer overflow); TEST;
SYNC 1, 2, and 3 (main-link
synchronization); ACTIV 1, 2,
and 3 (main-link data activity);
ACT (control-port data activity)
Temperature Tolerance: 32 to 122°F
(0 to 50°C)
Humidity Tolerance: Up to 90%,
noncondensing
Power: From AC outlet, through
detachable 5-ft. (1.5-m) power
cord and internal transformer:
Nominal input: 100–230 VAC,
47– 63 Hz;
Input-voltage tolerance:
90– 253 VAC;
Consumption: 30 watts
Size: 1.75"H x 8.5"W x 9.4"D
(4.4 x 21.6 x 23.9 cm)
Weight: 2.6 lb. (1.2 kg)
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• Cables to run from the control port to a distant terminal or PC,
from the DDS port to the WAN jack, or from the main-link ports
to other devices
• Rackmount Kit (LRRACK)
• AC-power and data-line surge protectors.
Additional Equipment You Might Need
• Frame Relay Access Device Switch-3 A/S, 3-Port
• (1) power cord
• (1) RJ-45 to DB25 adapter for the control port
• V.35 and X.21 models only: (1) adapter cable for each V.35 or X.21
port (used to patch the switch‘s DB25 connector to a V.35-native
M/34 connector or an X.21-native DB15 connector)
• Users’ manual
• Packet Switching Guide
Package Includes
Ordering Information
ITEM CODE
Frame Relay Access Device Switch-3 A/S
(Fradswitch-3 A/S), 3-Port
Port 1 (WAN) Ports 2 and 3 (Local)
RS-232 RS-232 MT760A-232/232
RS-232 V.35 MT760A-232/V35
V.35 V.35 MT760A-V35/V35
X.21 X.21 MT760A-X21/X21
RS-530 RS-530 MT760A-530/530
RS-530 RS-232 MT760A-530/232
DDS RS-232 MT760A-DDS/232
DDS V.35 MT760A-DDS/V35
Y
ou may also need…
RS-232 Cable
DB25 Male to DB9 Female................................EVMBMC
DB25 Male to DB25 Female .........................EDN25C-MF
DB25 Male to DB25 Male ...........................EDN25C-MM
RS-530 Cable, DB25 Male to DB25 Male .....EVN530-MM
V.35 Cable, M/34 Male to M/34 Male ............EYN450-MM
X.21 Cable, DB15 Male to DB15 Male .........EGM16E-MM
Stranded Category 5 Patch Cable (for DDS).....EVMSL05
Rackmount Kit.............................................................LRRACK
Use pairs of Frame Relay Access Device Switch-3 A/S units to run IP
over X.25 and extend your intranet from HQ to all of your corporate
sites—or your extranet to all your vendors and major accounts—
continent-wide.
Typical Application
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