Nortel Networks Welding System 411-2021-111 ユーザーズマニュアル
3-2
Cell Site Layouts
411-2021-111 Standard 01.01 June 1996
(ATC 1 and ATC 2) are combined through one phasing transformer (located at
ATC 2) and then connected to Duplexer position 2 and the main TX/RX
Antenna. The output of the upper ATC (ATC 3) is connected to Duplexer
position 3 and the diversity TX/RX Antenna. This arrangement is used to
meet the requirement of a minimum of 21 channel spacing (630 kHz)
between the channels in one RF Frame. This configuration requires a TX/RX
antenna to perform the diversity receive function of the cell. See Figure 3-3.
ATC 2) and then connected to Duplexer position 2 and the main TX/RX
Antenna. The output of the upper ATC (ATC 3) is connected to Duplexer
position 3 and the diversity TX/RX Antenna. This arrangement is used to
meet the requirement of a minimum of 21 channel spacing (630 kHz)
between the channels in one RF Frame. This configuration requires a TX/RX
antenna to perform the diversity receive function of the cell. See Figure 3-3.
Control Channel redundancy
Control Channel (CCH) redundancy is commonly provided with a Locate
Channel Receiver (LCR) backup. The CCH is assigned to position 1 on the
TRU/DPA Shelf 1 and the LCR is assigned to position 4 on the same shelf.
This arrangement will have the CCH and the LCR supplied on a different DC
power feed and a TCM card. No RF coaxial switch is required since the
cavity of the LCR position on the ATC will tune to the CCH frequency when
backup is required.
Channel Receiver (LCR) backup. The CCH is assigned to position 1 on the
TRU/DPA Shelf 1 and the LCR is assigned to position 4 on the same shelf.
This arrangement will have the CCH and the LCR supplied on a different DC
power feed and a TCM card. No RF coaxial switch is required since the
cavity of the LCR position on the ATC will tune to the CCH frequency when
backup is required.
Figure 3-1
Frame layout of an omni Metrocell with one RF frame (front view)
Frame layout of an omni Metrocell with one RF frame (front view)
Note:
For a frame with up to 20 channels, only one duplexer (located in
position 2) is required.
For a frame with 21 channels or more, two duplexers (located in
positions 2 and 3) are required.
position 2) is required.
For a frame with 21 channels or more, two duplexers (located in
positions 2 and 3) are required.
CE RIP
DRUM
ACU
HSMO
CSM2
RMC 1
ICRM
Blank Panel
Base
Base
TRU/DPA
Shelf 1
ATC 1
Duplexer
Position 3
RF RIP
TRU/DPA
Shelf 2
ATC 2
TRU/DPA
Shelf 3
ATC 3
CE Frame
RF Frame 1
Blank Panel
TRU 1
TRU 2
TRU 3
TRU 4
TRU 5
TRU 6
TRU 7
TRU 8
DPA
1
DPA
2
DPA
3
DPA
4
TRU 9
TRU 10
TRU 11
TRU 12
TRU 13
TRU 14
TRU 15
TRU 16
DPA
5
DPA
6
DPA
7
DPA
8
TRU 17
TRU 18
TRU 19
TRU 20
TRU 21
TRU 22
TRU 23
TRU 24
DPA
9
DPA
10
DPA
11
DPA
12
Duplexer
Position 1
Duplexer
Position 2