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Cisco TelePresence Room Design

Sample Chapter is provided courtesy of Cisco Press.
Date: Jun 17, 2009.

Chapter Information

Chapter Description

This chapter covers the spatial, aesthetic, environmental, and technical requirements for designing a space so that Cisco Telepresence participants can focus 100 percent of their attention on the people they meet with and the meeting content, and experience most of the same emotional and psychological interactions that occur when people meet face-to-face.

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Cisco TelePresence Fundamentals

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HVAC

The HVAC design goals for Cisco TelePresence rooms boil down to three primary criteria:

Generating enough air flow to keep the temperature of the room comfortable for the participants. This is measured in terms of British Thermal Units per hour (BTU/hr) and is a function of the heat generated by the TelePresence system and other electronic devices within the room, plus the heat generated by the human bodies within the room.
Achieving the above BTU/hr performance without generating high levels of ambient noise. Simply cranking up the air conditioning is rarely the best solution because it can result in a higher volume of wooshing sound coming through the HVAC registers (the vents that supply air to the room). You must strive to achieve a balance of the air flow:noise ratio.
Positioning the HVAC registers to maximize the efficiency of the air flow between the supply registers and the return registers. This is critical as it can effectively reduce the total amount of BTU/hr capacity required by as much as 25%, thereby reducing or eliminating the costs associated with upgrading the capacity of the HVAC system.

Tables 8-6, 8-7, and 8-8 summarize the BTU requirements for the CTS-3000, CTS-3200, and CTS-1000. These values include all the equipment and lighting provided with the system and the participants within the room. Note that the CTS-500 is designed to be deployed within an existing room with no HVAC modifications, and, therefore, a power consumption table for that model is not provided here.

TIP

The total BTU/hr provided at the bottom of each table can be reduced by 25% (multiply by .75) if the HVAC registers are positioned properly, as illustrated in Figure 8-42. This is because we can take advantage of the efficiency of the HVAC system to displace the warm air generated by the TelePresence System and the people, thereby reducing the amount of BTU capacity required, potentially saving the customer thousands of dollars in HVAC system upgrades.

Figure 8-42 Reflected ceiling plan showing recommended HVAC register locations

Table 8-6. BTU Requirements for the CTS-3000

Component	Maximum¹	Typical¹	Minimum¹	Idle¹
Plasma Displays	2,880w	2,658w	2,658w	9w
Primary Codec	120w	113w	113w	113w–120w
Secondary Codec (108w max / 101 average each)	216w	202w	202w	202w–216w
Light Façade	348w	348w	348w	0w
Laptop Power (240w max / 144w average each)	1,440w	864w	144w	0w
Projector	288w	225w	0w	0w–5w
Auxiliary LCD² (325w max / 230w average each)	975w	230w	0w	0.6w
Auxiliary Document Camera²	200w	200w	0w	0w
Total Wattage	6,467w	4,840w	3,465w	324w–350w
Total Amperage (wattage / volts)	54A @ 120V	41A @ 120V	28A @ 120V	3A @ 120V
	27A @ 240V	21A @ 240V	14A @ 240V	2A @ 240V
People (450 BTU/hr each)	2,700 BTU/hr	2,700 BTU/hr	450 BTU/hr	0 BTU/hr
Total BTU/hr (wattage * 3.413) + people³	24,772 BTU/hr	19,218 BTU/hr	12,276 BTU/hr	1,106–1,195 BTU/hr

Table 8-7. BTU Requirements for the CTS-3200

Component	Maximum¹	Typical¹	Minimum¹	Idle¹
Plasma Displays	2,880w	2,658w	2,658w	9w
Primary Codec	120w	113w	113w	113w–120w
Secondary Codec (108w max / 101 average each)	216w	202w	202w	202w–216w
Light Façade	348w	348w	348w	0w
Laptop Power (240w max / 144w average each)	4,320w	2,592w	144w	0w
Projector	288w	225w	0w	0w–5w
Auxiliary LCD (325w max / 230w average each)	975w	230w	0w	0.6w
Auxiliary Document Camera²	200w	0w	0w	0w
Total Wattage	9,347w	6,368w	3,465w	324w–350w
Total Amperage (wattage / volts)	54A @ 120V	41A @ 120V	28A @ 120V	3A @ 120V
	27A @ 240V	21A @ 240V	14A @ 240V	2A @ 240V
People (450 BTU/hr each)	8,100 BTU/hr	5,400 BTU/hr	450 BTU/hr	0 BTU/hr
Total BTU/hr (wattage * 3.413) + people³	40,000 BTU/hr	27,134 BTU/hr	12,276 BTU/hr	1,106–1,195 BTU/hr

Table 8-8. BTU Requirements for the CTS-1000

Component	Maximum¹	Typical¹	Minimum¹	Idle¹
Plasma Displays	960w	886w	886w	3w
Primary Codec	120w	113w	113w	113w–120w
Light Façade	80w	80w	80w	0w
Laptop Power (240w max / 144w average each)	480w	288w	144w	0w
Auxiliary LCD²	325w	36w	0w	0w–5w
Auxiliary Document Camera²	200w	0w	0w	0w
Total Wattage	2,165w	1,403w	1,223w	116w–128w
Total Amperage (wattage / volts)	19A @ 120V	12A @ 120V	10A @ 120V	2A @ 120V
	10A @ 240V	6A @ 240V	5A @ 240V	1A @ 240V
People (450 BTU/hr each)	900 BTU/hr	450 BTU/hr	450 BTU/hr	0 BTU/hr
Total BTU/hr (wattage * 3.413) + people³	8,289 BTU/hr	5,238 BTU/hr	4,624 BTU/hr	396–437 BTU/hr

Table 8-9. Power Requirements for Auxiliary Displays and Document Cameras

Vendor – Model	Maximum	Idle
NEC LCD1770NX	36w	<3w
NEC LCD2070NX	50w	<3w
NEC LCD4010	230w	<5w
NEC LCD4020	240w	<5w
NEC LCD4610	260w	<5w
NEC LCD4620	240w	<5w
Samsung 400PXN	230w	<1w
Samsung 460PXN	310w	<1w
Sharp PN-525U	325w	<1w
WolfVision VZ-9plus	55w	0w
WolfVision VZ-C122	200w	0w
WolfVision VZ-C32	200w	0w

HVAC Air Noise Diffusion Considerations

As mentioned previously in the "Acoustics" section, to meet these BTU requirements without exceeding the ambient noise threshold of 46dB, the recommendation is that you always use NC30-rated air registers, which diffuse the air flowing out of the register to reduce the air flow noise. To maximize the efficiency of the air flow through the room, you should locate the supply registers behind the participants and the return registers directly over the 65-inch plasma displays of the TelePresence system. Doing so can reduce the capacity requirements of the HVAC substantially. Figure 8-42 illustrates such an arrangement for a CTS-3000 room.

Finally, measure the temperature of the air flowing out of the register. (Use a laser thermometer pointed directly at the register from 3 feet [1 meter] away.) If the temperature of the air is warmer than 70-degrees Fahrenheit (21-degrees Celsius), it is probably too warm to be effective, and your HVAC system might need to be recharged. However, if the temperature of the air is colder than 55-degrees Fahrenheit (12° Celsius), it might cause discomfort for the participants standing or sitting directly beneath the register. An HVAC specialist can further assist you in measuring and designing the HVAC system.

6. Power Requirements | Next Section Previous Section

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