Cisco Systems OL-24281-01, 2900 Installing the Dome Drive, Cable Type, Maximum Distance, Ac/Dc

Chapter 1 Installation

Installing the Dome Drive

Table 1-1shows the maximum distances for video coaxial cable types. A cable must meet these requirements:

•75-ohm impedance

•All-copper center conductor

•All-copper braided shield with 95 percent braid coverage

Table 1-1 Video Coaxial Cable Requirements

Cable Type

RG59/U

RG6/U

RG11/U

Maximum Distance

750 ft (229 m)

1,000 ft (305 m)

1,500 ft (457 m)

Table 1-2shows the recommended maximum distances for 24 VAC and 24 VDC applications, which are calculated with a 10 percent voltage drop. (Ten percent is generally the maximum allowable voltage drop for AC- or DC-powered devices.)

Table 1-2	24 VAC/24 VDC Wiring Distances
AC/DC		Wire Gauge
Total VA/
		20 AWG (0.5 mm2)	18 AWG (1.05 mm2)	16 AWG (1.5 mm2)	14 AWG (2.5 mm2)
Total Watts
23VA/15 W		123 ft (38 m)	196 ft (60 m)	311 ft (95 m)	495 ft (151 m)
73 VA/65 W		39 ft (12 m)	62 ft (19 m)	98 ft (30 m)	156 ft (48 m)

Note Input power for the dome is 24 VAC or 24 VDC. Using 24 VAC input power, power consumption is 23 VA per dome for indoor models and 73 VA for outdoor models. Using 24 VDC input power, power consumption is 0.7 A (15 W) for indoor models and 3 A (65 W) for outdoor models.

Use a 24 VAC transformer with the following minimum VA:

•40 VA per dome—For indoor models (without heater)

•100 VA per dome—For outdoor models (with heater)

Installing the Dome Drive

Step 1 If you will view video using both analog and IP connections, set the DIP switches on the top of the dome drive (see Figure 1-9).

For DIP switch settings, see the labels located on the top of the dome drive, or see the “Switch Settings” section on page 1-11.

If you will view video using the IP connection, you do not need to set the DIP switches.

Cisco Video Surveillance IP PTZ Dome Camera User Guide, Cisco 2900 Series IP Dome

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