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Appendix 5

Videoconferencing Bandwidth Requirements

                24bit@25fps  8bit@25fps  8bit@15fps   8bit@5fps


VGA (640x480)    184 Mbit/s   61 Mbit/s   36 Mbit/s   12 Mbit/s
SCIF (704x576)   240 Mbit/s   80 Mbit/s   48 Mbit/s   16 Mbit/s
CIF (352x288)     60 Mbit/s   20 Mbit/s   12 Mbit/s    4 Mbit/s
QCIF (176x144)    15 Mbit/s    5 Mbit/s    3 Mbit/s    1 Mbit/s

Carriers

ATM                 Up to Gigabit/sec range
Fast Ethernet       100 Mbit/s
Ethernet             10 Mbit/s
Basic Rate ISDN      64 Kbit/s (x2)
Primary Rate ISDN    64 Kbit/s (x30) (max 1920 Kbit/sec)

Compression Methods

JPEG      > 100
MPEG      similar to JPEG
CELLB     10 to 20 times
H261      10 and up times
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