Motorola SG 2000 Analog Return Path RF Configuration, Redundant return, Split return

O p e r a t i o n 5 - 5

Analog Return Path RF Configuration

If you are using a single optical transmitter, it must be installed in the optical transmitter A position as illustrated in Figure 3-1. A JXP-15A (15 dB) pad must also be installed in the pad facility at the B transmitter location to terminate the signal from the return-path-module combiner board (SG2-RPM/C).

For single return applications, the SG2-LIDB distributes an individual RF signal from the RF chassis to transmitter A. Installing an optional second transmitter (B) provides return redundancy as illustrated in Figure 5-7. Installing a redundant B transmitter also requires that you change the pad at that location to a JXP-5A.

Figure 5-7

Redundant return

LID

	TP
Optional
		JXP
transmitter
A

Optional

transmitterJXP

B

TP

BASE			Status
		monitor
	SG2-RPM/C
	SG2-RPLPF
							TP
						H
	LP filter
			Ingress	JXP		L
					TP

Bulkhead connector for dc power

Alternatively, a second transmitter can be used to double the available return bandwidth by having each transmitter carry the return signals from only two ports. This is illustrated in Figure 5-8. It requires that the SG2-RPM/C (located on the bottom side of the RF chassis) be changed to a return-path-module split board (SG2-RPM/S) as illustrated in Figure 5-9:

Figure 5-8

Split return

LID

	TP
Optional
		JXP
transmitter
A

Optional

transmitterJXP

B

TP

BASE			Status
	SG2-RPM/S	monitor
	SG2-RPLPF
	LP filter					TP
					H
	LP filter		Ingress	JXP	L

TP

SG 2000 Installation and O peration Manual