Cisco Systems UBR7225VXR specifications Downstream Optical +10 dBmV Receiver +13 dBmV Attenuator

Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend

Connecting and Configuring the Upstream

Figure 4-25 Calibrating Multiple “X-level” Test Points Connected to Multiple Upstream Ports

Cisco

uBR7225VXR

Upstream 0 dBmV

2-way splitter

2-way splitter

2-way splitter

		Downstream									Optical
			+10 dBmV								receiver
	6 dB			X			3 dB			+13 dBmV
attenuator					attenuator
					Diplex filter
40 dB							L	H	Downstream
attenuator
									(0 to +5 dBmV)
								C
							Cable
						modem
											Optical
			+10 dBmV								receiver
										+18 dBmV
	6 dB			X			3 dB
attenuator					attenuator
					Diplex filter
40 dB									Downstream
attenuator							L	H
									(0 to +5 dBmV)
								C
							Cable
						modem
											Optical
			+10 dBmV								receiver
										+31 dBmV
	6 dB			X			21 dB
attenuator					attenuator
					Diplex filter
40 dB							L	H	Downstream
attenuator
									(0 to +5 dBmV)
								C
							Cable
						modem

	Reverse optical		Cable
			modems
Fiber-optic transmitter
			+31 dBmV
cable	+17 dBmV	Distribution	+48 dBmV
		network
			Modem
			transmit
			levels

	Reverse optical
Fiber-optic transmitter		+58 dBmV
cable	+17 dBmV	Distribution

network +42 dBmV Modem transmit

levels

Reverse optical		+50 dBmV
Fiber-optic	transmitter
cable	+17 dBmV	Distribution +42 dBmV
		network
		+49 dBmV
		Modem
		transmit
		levels
		271678

	Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02		4-21