Black Box DSU MS Manuale Utente

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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 point-
to-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 higher-
speed 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.

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

• Routing/bridging.
• SNA/SDLC systems.
• High-speed asynchronous systems.
• Frame-Relay networks.
• Statistical multiplexor links.