Nortel Networks Welding System 411-2021-111 User Manual
1-4
Introduction
411-2021-111 Standard 01.01 June 1996
The 800 MHz cellular band
In an 800 MHz North American cellular system, a frequency spectrum of 50
MHz is available for service. Operating from 824 to 894 MHz, including the
expanded spectrum, the system conforms to the AMPS IS-54 protocol.
Typically this range is divided into 832 radio frequency (RF) channels.
MHz is available for service. Operating from 824 to 894 MHz, including the
expanded spectrum, the system conforms to the AMPS IS-54 protocol.
Typically this range is divided into 832 radio frequency (RF) channels.
The 832
RF channels are divided into two bands, A and B. The two bands are identified
as follows:
as follows:
•
Band A—for Non-Wireline Operators
•
Band B—for Wireline Operators.
Each frequency band has 416 RF channels. Of these 416 RF channels,
typically 21 (depending on the frequency plan) are assigned as the Control
Channels (CCH) and the remaining 395 are Voice Channels (VCH). See
Figure 1-4 and Table 1-1.
typically 21 (depending on the frequency plan) are assigned as the Control
Channels (CCH) and the remaining 395 are Voice Channels (VCH). See
Figure 1-4 and Table 1-1.
Figure 1-4
Channel assignment for 800 MHz cellular systems
Channel assignment for 800 MHz cellular systems
A"
A
B
A'
B'
Base Station Frequency (MHz)
Channel Number
R
1023
1
333
666 716
799
824 825
835
835 846.5
849
851
869 870
880
890 891.5
894
896
TX
RX
R=Reserved
Band
Channel assignment
Band A (416 channels) Band B (416 channels)
Control channels
313 - 333 (21)
334 - 354 (21)
Optional—TDMA secondary
control channels
control channels
688 - 708 (21)
737 - 757 (21)
Voice channels
001 - 312 (312)
667 - 716 (50)
991 - 1023 (33)
667 - 716 (50)
991 - 1023 (33)
355 - 666 (312)
717 - 799 (83)
717 - 799 (83)
A-Band CCH
B-Band CCH
991