Dolby Laboratories DP503 - Manual (Page 18)

2A-2
audio bandwidth while 112/128 kbps calls provide 15-20 kHz audio bandwidth.
The 112/128 calls combine or "inverse multiplex" the two switched 56 or 64 kbps
ISDN B channels together to provide a higher bandwidth transmission path. Sites
that conform to the international inverse multiplexing standard Bonding Mode 1
can be accessed with your Dolby Fax system. Refer to the glossary in Appendix E
for more information on inverse multiplexing.
The DP503 also offers Dolby Digital (Dolby AC-3) in mono, stereo and joint
stereo modes with data rates ranging from 56-384 kbps. With this range of data
rates and their associated audio bandwidths, you can determine the tradeoff you
would like to make in terms of audio quality and call cost; this flexibility is
available when connecting to other Dolby Fax users with the DP503/DP524 codec
equipment. Dolby Digital (Dolby AC-3) is the same technology used in the Dolby
Digital film format, the DVD, US Advanced Television, as well as cable radio and
satellite audio services.
ISDN
256
kbit/s
256
kbit/s
2 Chnls
Audio +
Data
2 Chnls
Audio +
Data
DP503
Encoder
DP524
Decoder
256
kbit/s
256
kbit/s
2 Chnls
Audio +
Data
2 Chnls
Audio +
Data
DP524
Decoder
DP503
Encoder
ISDN TA/
Imux ISDN TA/
Imux
Dolby Fax - Send and Receive system Dolby Fax - Send and Receive system
Fig 1. Dolby Fax Sample Block Diagram
2A.3 Quick Start for Equipment Installation
Note: Refer to Sections 4 and 5 for comprehensive information.
Pre-Installation involves:
N Unpacking
N Inspection for damage
N Checking fusing
N Configuring internal jumpers (DP503 & DP524)
N Configuring rear panel switches (DP503 & DP524)
N Mounting rack ears (ISDN unit)
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