Nortel Networks 411-2021-111 manual 12Cell Site Layouts

3-12Cell Site Layouts

Transmit cabling

In the transmit path, the output of each Transmit Receive Unit (TRU) is connected to the input of each corresponding power amplifier (PA) on the Dual Power Amplifier (DPA) module.

For a 120° STSR cell site with one RF Frame, each TRU/DPA Shelf and its associated ATC and duplexer serve for one of the three sectors; TRU/DPA Shelf 1, ATC 1 and Duplexer 1 for Sector X, TRU/DPA Shelf 2, ATC 2 and Duplexer 2 for Sector Y and TRU/DPA Shelf 3, ATC 3 and Duplexer 3 for Sector Z. The output of each power amplifier (PA) is input to an 8-channel AutoTune Combiner (ATC). The output of each 8-channel ATC is connected to the Transmit (TX) port of each corresponding duplexer. Table 3-5 lists the connection between the PAs and the ATC for a 120° STSR cell site using one RF Frame for three sectors.

For a 120° STSR cell site with three RF Frames, each frame serves for one of the three sectors; RF Frame 1 for Sector X, RF Frame 2 for Sector Y and RF Frame 3 for Sector Z. With an RF Frame holding up to 20 channels, only one duplexer is required. With 21 or more channels in one RF Frame, two duplexers are required. Table 3-6 lists the connection between the PAs and the ATC for an RF Frame with up to 20 channels. Table 3-7 lists the connection between the PAs and the ATC for an RF Frame with 21 channels or more.

Table 3-5

PA to ATC connection for a 120° Metrocell with one RF Frame

	From	Through			To
	DPA 1 - Port1 (CCH)		ATC1 - Port 1
	DPA 1 - Port2		ATC1 - Port 2
	DPA 2 - Port1		ATC1 - Port 3
TRU/DPA	DPA 2 - Port2 (LCR)	ATC Shelf 1	ATC1 - Port 4	Duplexer		Antenna
Shelf 1				Position 1		(Main receive
	DPA 3 - Port1		ATC1 - Port 5
						for Sector X)
	DPA 3 - Port2		ATC1 - Port 6
	DPA 4 - Port1		ATC1 - Port 7
	DPA 4 - Port2		ATC1 - Port 8
	DPA 5 - Port1 (CCH)		ATC2 - Port 1
	DPA 5 - Port2		ATC2 - Port 2
	DPA 6 - Port1		ATC2 - Port 3
TRU/DPA	DPA 6 - Port2 (LCR)	ATC Shelf 2	ATC2 - Port 4	Duplexer		Antenna
Shelf 2				Position 2		(Main receive
	DPA 7 - Port1		ATC2 - Port 5
						for Sector Y)
	DPA 7 - Port 2		ATC2 - Port 6
	DPA 8 - Port1		ATC2 - Port 7
	DPA 8 - Port 2		ATC2 - Port 8

411-2021-111 Standard 01.01 June 1996