Configure and dial quickly, conveniently,
with the front-panel controls.
Configure and dial quickly, conveniently,
with the front-panel controls.
CSU/DSU MS
© 2007. All rights reserved. Black Box Corporation.
FREE 24-hour Tech Support: 724-746-5500
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FEATURES
• Supports up to seven speeds—2.4,
4.8, 9.6, 19.2, 38.4, 56, and 64 kbps.
• DTE service rate-matching allows
slower DTE devices to communicate
over higher-speed digital line.
• CSU/DSU dialer gives you convenient,
fingertip menu control.
OVERVIEW
The cost of Digital Data Service (DDS) lines has been steadily
decreasing and is now comparable to the cost of leased analog
lines. But DDS has two distinct advantages over analog service:
data moves at higher speeds, allowing transmission of larger
volumes; and data error rates are greatly reduced.
If you are making the decision to switch from analog to
DDS, or if you want to expand the capabilities you now have
with DDS, consider our CSU/DSU. Typically, a CSU/DSU replaces
the modem in a network and supports either sync or async data
formats at speeds of 2.4, 4.8, 9.6, 19.2, and 56 kbps in pointto-point or multipoint configurations (see the diagram above).
Our CSU/DSU MS supports the traditional five speeds,
but also gives you the additional speeds of 38.4 and 64 kbps.
If you need to transmit larger volumes of data, the higher
speeds of the CSU/DSU MS are the solution. The CSU/DSU MS
also supports a secondary async channel that enables you to
piggyback data up to 2400 bps (this service must also be
supported by your local telephone company).
Making the move from analog to digital doesn’t mean
replacing all your DTE devices with “fast” equipment designed
for digital. The CSU/DSU MS has a DTE rate-matching feature
that allows your slower DTEs to communicate over higherspeed digital lines (56-kbps only).
The CSU/DSU has a wide receiver range, from 0 to -45 dBm
at 56-kbps loop rate, so you can transmit data over loops up
to 18,000 feet long via 26 AWG wire.
CSU/DSU MS
(MT132V-R2)
DTE
(Pittsburgh)
1/30/2007
#11457
724-746-5500 blackbox.com
DTE
(Boston)
56-kbps DDS line
56-kbps DDS line
Multiplexors
Central Telephone Office
CSU/DSU MS
(MT132V-R2)
TYPICAL APPLICATIONS
• Routing/bridging.
• SNA/SDLC systems.
• High-speed asynchronous systems.
• Frame-Relay networks.
• Statistical multiplexor links.
Typical DDS configuration.
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TECH SPECS
Diagnostics — DTE, DTE/loop, DTE with test pattern, loop only, test
pattern
DTE Rates — 2.4, 4.8, 9.6, 19.2 kbps sync or async; 38.4, 56,
or 64 kbps sync
User Controls — (16) front-panel buttons: Enter, Up-Arrow, Down-
Arrow, Cancel, 0–9, #, *
Interface — V.35 or RS-232 sync or async
Connectors — (2) DB25 female, (1) M/34 female, (1) RJ-48C
Indicators — (7) LEDs: RS, CS, TD, RD, CD, ALRM, TST
Power — 115 VAC, 60 Hz, 8 watts
Size — 2.3"H x 8.8"W x 10.3"D (5.8 x 22.4 x 26.2 cm)
Weight — 3 lb. (1.4 kg)
1/30/2007
#11457
✦
The CSU/DSU MS
✦ RJ-45 line cable
✦
User’s manual
WHAT‘S INCLUDED
Item Code
CSU/DSU MS MT132V-R2
• Digital Data Service (DDS) is a wide-bandwidth, private leased
line that transmits data in digital, rather than analog, format.
DDS lines are 4-wire circuits (Transmit pair, Receive pair) linked
by special repeaters and separated from conventional analog
lines. They can provide a higher data-transmission rate and
maintain a higher level of data integrity than analog transmission service.
• DDS is a nationwide service of AT&T
®
that allows interconnection and transport of data for the regional Bell
operating companies. The telephone companies provide
a DDS-compatible service within their region and provide
the local loop service to DDS customers.
• An ISU (Integrated Service Unit) replaces the modem in a
network. A combination of the CSU (Channel Service Unit)
and the DSU (Data Service Unit), it is usually called a CSU/DSU.
• The CSU/DSU MS provides the standard DDS rates of 2.4, 4.8,
9.6, 19.2 kbps sync or async, and 56 kbps sync. It also provides
DDS rates of 38.4 and 64 kbps.
• The CSU/DSU MS supports DTE rate adaption to 2.4, 4.8, 9.6,
19.2, and 56 kbps at 56-kbps loop speed. Secondary channel
operation is supported at all speeds except 64 kbps, with
terminal rates of 75, 150, 300, 600, 1200, and 2400 bps.
The asynchronous primary channel is supported at all rates up
to and including 19.2 kbps with secondary and nonsecondary
channel operation.
Technically Speaking
• Front-panel controls are used for configuration and testing.
The CSU/DSU can generate and monitor either of two
industry-standard test patterns during selected tests, and
report the number of errors on a front-panel display. It will
also respond to standard DSU and CSU loopback commands
from the telephone company central office or DDS/V.54
commands from a remote CSU/DSU MS.
• Seven LEDs show the status of the primary and secondary
DTE interface leads.
• Three data DTE connectors on the rear panel provide a
primary-channel V.35 or RS-232, and a secondary-channel
RS-232 port. In Switched-56 operation, the secondary
channel is used for control. An 8-pin telco jack, the power
cord, and a fuse are also located on the rear panel.
• Each unit includes an 8-foot (2.4-m) power cord. The power
cord is terminated by a 3-prong plug that connects to a
grounded power receptacle.
NOTE: Use only a grounded, 115-VAC, 60-Hz receptacle.
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