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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
Split one DDS line into
two high-speed
subchannels.
Easy configuration
and management.
Complete diagnostics.
Finds network faults
fast to minimize
downtime.
RS-232 subchannel
runs at speeds up to
56 kbps; V.35 subchannel operates up to
64 kbps.
Sync or async (RS-232)
or sync only (V.35)
operation.
I
f you’re craving for line savings,
Black Box has a piping-hot
solution that’s perfect for you.
The 2-Channel CSU/DSU
offers two independent highspeed digital channels that simultaneously transfer data over one
DDS line. There are no monthly
bills for a second DDS line—and
no costs for additional hardware!
The CSU/DSU’s channels
operate at data rates between
2400 bps and 56 or 64 kbps. Select
a combination of port speeds for
either async or sync operation.
The sum of the port speeds must
be less than (not equal to) the
selected line speed.
Configure Port 1 for V.35 or
RS-232 operation via its M/34 or
More for your money!
Run two channels over
a single DDS line.
Key Features
2-CHANNEL CSU/DSU
7/22/2005 #10700
DB25 connector. Port 2 is supported with a single DB25 RS-232
interface.
Limited-distance modem
operation is also available when
the 2-Channel CSU/DSU is configured with a master clock
setting. The unit can operate
error-free—up to 10 miles
(16.1 km)—at 64 kbps over
19-gauge copper wire!
A front-panel LCD display
provides a visual interface into
the unit’s menu system. The menu
system enables you to configure,
test, and monitor the unit’s
operation.
Three buttons allow for DDS
port and line settings (Advance)
management, selection of an operational display (Select), and
performing diagnostics (Enter).
Diagnostics include Self-Test,
Digital Loop, Local Loop, and
Remote Loop. The unit can quickly
isolate network faults and minimize your network downtime—
and that means even greater
savings!
The 2-Channel CSU/DSU is
also foolproof. Even if the ports
are accidentally misconfigured,
a factory reset is as simple as
pressing all three buttons while
powering up. Factory reset
returns the CSU/DSU to original
settings, so you can easily fix
what went wrong.
© 2005. All rights reserved.
Black Box Corporation.
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Ordering Information
ITEM CODE
2-Channel CSU/DSU..................................................MT148A
Diagnostics: V.54 loopback tests
Speed: RS-232: 2400, 4800, and
9600 bps, 19.2, 38.4, and
56 kbps (sync or async);
V.35: 2400, 4800, 9600 bps, 19.2,
38.4, 56, and 64 kbps (sync
only);
DDS: 64 kbps (sync only)
Distance (Maximum): DDS circuit
(RJ-48 connector): Up to 10 mi.
(16.1 km) at 64 kbps over
19-gauge copper cable
Command Mode: Front panel
Leads Supported: Local mapping
1–8, 15, 17, 20
Line Type: DDS
Modulation: TDM
Operation: Full duplex
Protocol: Sync or async
User Controls: (3) front-panel
buttons: Select, Advance,
and Enter
Interface: Channel ports: RS-232 or
V.35;
Line port: DDS
Connectors: (1) Power;
Subchannel port 1: (1) M/34
female, (1) DB25 female;
Subchannel port 2: (1) DB25
female;
DDS line port: (1) RJ-48
Indicators: 16-character LCD
Power: 115 VAC, 60 Hz
Size: 2.5"H x 7.8"W x 6.8"D
(6.4 x 19.8 x 17.3 cm)
Weight: 2 lb. (0.9 kg)
Specifications
• 2-Channel CSU/DSU
• (1) RJ-45 to RJ-45 cable (DDS input)
• (1) Power supply
• A user’s manual
What the Package Includes
Recognize any of these
situations?
• You wait more than 30
minutes to get through to a
vendor’s tech support.
• The so-called “tech” can’t
help you or gives you the
wrong answer.
• You don’t have a purchase
order number and the tech
refuses to help you.
• 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 V alue.Exceptional Tech Support.Period.
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