DIGITAL DATA SERVICE


Digital Data Service (DDS) is an

accurate, reliable, and cost-efficient

way to transmit digital data between

two or more points.  Since 1984, this

service has been available in 90% of

Pacific Bell territory.


Digital Data Service provides a digital

transmission medium that requires no

modems.  Unlike the analog signal,

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which must be reamplified frequently

along the transmission route, Digital

Data Service periodically regenerates 

(re-creates) the digital signal,

virtually eliminating many of the

design considerations associated with

analog transmission (noise, errors, 

conditioning requirements).

Digital Data Services' continual signal

regeneration through the system removes

signal noise and distortion giving you
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99.5% error-free seconds of

transmission.  Digital Data Services

have no transmission errors caused by

analog impairments and require no line

conditioning.  Also, there is 

centralized clocking to time the system

components, with a hierarchy of timing

systems based on one master atomic

clock.  Plus, all these advantages are

built right into the digital system. 


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As a result, Digital Data Services

eliminate costly retransmissions and

free the customer from scheduling

backlogs. 


High reliability practically eliminates

downtime.  Digital Data Service is

designed to deliver an average 99.96%

availability, that's a mere three and

half hour's down-time, long-term

average, per year.  To ensure this high

availability, each circuit has an

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"Automatic Protective Switching"

feature that provides a "hot" back-up

for the portion of the circuit that

runs between Central Offices.  What's

more, the system is engineered with

centralized testing diagnostics to

detect and pinpoint problems for rapid

solution. 








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The all-digital technology of Digital

Data Service is designed to help save

you money.  The bottom line to Digital

Data Service is its cost effectiveness:

Heightened accuracy and availability

translate into heightened productivity.

Better still, you can get increased

performance without increased expenses

for new terminals, additional computer

capacity, or onsite Network Management

equipment. 

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For more information on Digital Data 

Service, call  1-(800) PAC-DATA.











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