CDMA Technology Overview February, 2001 - Page 2-3
Pilot Walsh 0
Walsh 19
Paging Walsh 1
Walsh 6
Walsh 11
Walsh 20
Sync Walsh 32
Walsh 42
Walsh 37
Walsh 41
Walsh 56
Walsh 60
Walsh 55
Code Channels in the Forward Direction
PILOT: WALSH CODE 0
The Pilot is a “structural beacon” which does
not contain a character stream. It is a timing
source used in system acquisition and as a
measurement device during handoffs
SYNC: WALSH CODE 32
This carries a data stream of system
identification and parameter information
used by mobiles during system acquisition
PAGING: WALSH CODES 1 up to 7
There can be from one to seven paging
channels as determined by capacity needs.
They carry pages, system parameters
information, and call setup orders
TRAFFIC: any remaining WALSH codes
The traffic channels are assigned to
individual users to carry call traffic. All
remaining Walsh codes are available,
subject to overall capacity limited by noise
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