TESIRA HEAT GENERATION
INTRODUCTION
It’s hard to do much of anything without generating some heat.
When several pieces of electronic equipment are working together in a small area, such as a rack of audio equipment, the dissipated
heat must be considered in overall system and facility design.
This document presents a method of estimating power dissipation (also known as “heat loading”) of the Tesira Platform.
These estimates are useful for system and facilities planning.
DETAILS
Tesira is a flexible hardware platform and so the actual Heat dissipation for Tesira depends on a) the type of Tesira device in
question and, b) the number and type of options installed in that device, if applicable.
There are two types of equipment to consider in the Tesira range:
1.
Configurable Hardware:
Server, Server IO, Ex-MOD
2.
Fixed I/O Hardware:
Ex-IN, Ex-OUT, Ex-IO, Ex-LOGIC
For Tesira devices with a fixed hardware configuration, the power dissipation is simply a set figure for each device.
†
For Tesira devices that are configurable (option cards available for audio input/output and/or DSP expansion) the actual power
dissipation per unit will be determined by the Base Unit plus the number and type of the option cards fitted to that unit.
For the Ex-MOD this calculation is very simple because the options are very simple; for the Servers this calculation is a little more
complicated because of the number of options available.
Actual power dissipation (P), i.e. rate of heat dissipation or “heat loading”, for a complete Tesira system can be represented by the
following equation:
P = (Server Base/s + Option Cards) + (Server IO Base/s + Option Cards) + (Ex-MOD Base/s + Option Cards) + Expander/s
We will now expand each section of the equation.
†
Remember that the remote expanders require Power Over Ethernet (PoE+ for Ex-IN, Ex-OUT and Ex-IO; PoE for Ex-LOGIC). Only
Tesira equipment is listed here so you may need to include the heat dissipation figures of the PoE power supply equipment.
SERVER
Figure 1 – Tesira Server back panel
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The Tesira Server Base Unit comes fitted with 1 * SNC-2 card (network and control), 1 * DSP-2 card (internal) and 1 * AVB-1 card.
It also has expansion slots available for the following additional option cards:
7 * DSP-2 cards (internal slots) and 1 * I/O cards (back-panel slots).
So the full equation to find the actual power dissipation for a Server (PSERVER) is:
PSERVER:
Server Base
+
(x * DSP-2)
Where:
x
≤ 7
+
(y * [any Server i/o card])
Where:
y
≤ 1
=
PSERVER
SERVER IO
Figure 2 – Tesira Server IO back panel
The Tesira Server IO Base Unit comes fitted with 1 * SNC-1 card (network and control) and 1 * DSP-2 card (internal).
It also has expansion slots available for the following additional option cards:
2 * DSP-2 cards (internal slots) and 13 * I/O cards (back-panel slots).
Up to 13 I/O options cards can be fitted to a single Server IO, the maximum number for each type of card is:
1 * AVB-1; 2 * SCM-1; 12 * SIC-4; 12 * SOC-4; 12 * SEC-4; 12 * SAC-4; 6 * STC-2 and/or SVC-2 (6 * telephony cards maximum)
So the full equation for the Server IO is:
PSERVERIO:
Server IO Base
+
(x * DSP-2)
Where:
x
≤
2
+
(a * AVB-1)
Where:
a
≤
1
+
(b * SCM-1)
Where:
b
≤
2
+
(c * SIC-4)
Where:
c
≤ 12
+
(d * SOC-4)
Where:
d
≤ 12
+
(e * SEC-4)
Where:
e
≤ 12
+
(f * SAC-4)
Where:
f
≤ 12
+
(g * STC-2)
Where:
g
≤
6
+
(h * SVC-2)
Where:
h
≤
6
=
PSERVERIO
And where:
And where:
BIAMP SYSTEMS TECHNICAL SUPPORT GROUP
a
g
… h
+ h
≤ 13
≤
6
www.biamp.com • Page 2 of 7
Ex-MOD
Figure 3 – Ex-MOD back panel
The Tesira Ex-MOD Base Unit does not have any option cards factory fitted as standard.
It has three back panel expansion slots available for:
3 * Ex-Mod I/O option cards
All Ex-MOD options cards have the same power dissipation, so the full equation for the Ex-MOD is:
PEX-MOD:
Ex-MOD Base
+
(z * [any Ex-MOD i/o card])
=
PEX-MOD
Where:
z
≤ 3
Remote Expanders
Now let’s look at the remote expanders, which all have a fixed hardware configuration.
Figure 4 – Remote Expander back panels (clockwise from top-left: Ex-IN, Ex-OUT, Ex-IO, Ex-LOGIC)
The figures for these Tesira units are very simple:
The audio expanders, the Ex-IN, Ex-OUT and Ex-IO, each have an identical and fixed power dissipation figure.
The logic expander, Ex-LOGIC, has a fixed power dissipation figure.
PEX-(AUDIO)
=
Ex-IN = Ex-OUT = Ex-IO
PEX-LOGIC
=
Ex-LOGIC
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Full power dissipation listings for all Tesira devices
Server
Note:
Base Unit
Power (Watts)
Heat (BTUs/hr.)
50
171
4
14
Chassis + (1 * SNC-2) + (1 * DSP-2) + (1 * AVB-1)
Additional DSP
DSP-2
max: 7 (total 8 DSP-2 cards per Server ≤ 8)
I/O Card Option
1 card only
AVB-1
4
14
SCM-1
2
7
SIC-4
3
10
SOC-4
3
10
SEC-4
5
17
SAC-4
5
17
STC-2
1
3
SVC-2
1
3
Power (Watts)
Heat (BTUs/hr.)
46
157
max: 2 (total DSP-2 cards per Server IO ≤ 3)
4
14
14
Server IO
Base Unit
Note:
Chassis + (1 * SNC-1) + (1* DSP-2)
Additional DSP
DSP-2
I/O Card Options
AVB-1
max: 1
4
SCM-1
max: 2
2
7
SIC-4
max: 12
3
10
SOC-4
max: 12
3
10
SEC-4
max: 12
5
17
SAC-4
max: 12
5
17
STC-2
max: 6 telephony cards (STC-2 + SVC-2)
1
3
SVC-2
max: 6 telephony cards (STC-2 + SVC-2)
1
3
EX-MOD
Base Unit (no cards installed)
Power (Watts)
Heat (BTUs/hr.)
20
68
I/O Card Options
EIC-4
3
10
EOC-4
3
10
EIOC-4
3
10
Remote Expanders
Power (Watts)
Heat (BTUs/hr.)
EX-IN
23
78
EX-OUT
23
78
EX-IO
23
78
EX-LOGIC
3.5
12
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Example in Watts
1 * Server; additional option cards: 6 * DSP-2; 1 * SCM-1
1 * Server IO; additional option cards: 2 * DSP-2; 1 * AVB-1; 1 * SCM-1; 2 * SIC-4; 3 * SOC-4; 2 * SAC-4; 3 * SVC-2
1 * Ex-MOD; additional cards: 1 * EIC-4; 1 * EOC; 1 * EIOC-4
1 * Ex-MOD; additional cards: 1 * EIC-4; 1 * EIOC-4
2 * Ex-IN
3 * Ex-OUT
4 * Ex-IO
5 * Ex-LOGIC
PSERVER
PSERVERIO
PEX-MOD #1
PEX-MOD #2
PEX-(AUDIO)
PEX-LOGIC
=
Base + (6 * DSP-2) + (1 * SCM-1)
=
50W + (6 * 4W) + (1 * 2W)
=
50W + 24W + 2W
=
76W
=
Base + (2 * DSP-2) + (1 * AVB-1) + (1 * SCM-1) + (2 * SIC-4) + (3 * SOC-4) + (2 * SAC-4) + (3 * SVC-2)
=
46W + (2 * 4W) + (1 * 4W) + (1 * 2W) + (2 * 3W) + (3 * 3W) + (2 * 5W) + (3 * 1W)
=
46W + 8W + 4W + 2W + 6W + 9W + 10W + 3W
=
88W
=
Base + (1 * EIC-4) + (1 * EOC-4) + (1 * EIOC-4)
=
20W + (3 * 3W)
=
29W
=
Base + (1 * EIC-4) + (1 * EIOC-4)
=
20W + (2 * 3W)
=
23W
=
(2 * Ex-IN) + (3 * Ex-OUT) + (4 * Ex-IO)
=
9 * 23W
=
207W
=
5 * Ex-LOGIC
5 * 3.5
17.5W
PTOTAL
PTOTAL
=
PSERVER + PSERVERIO + PEX-MOD #1 + PEX-MOD #2 + PEX-(AUDIO) + PEX-LOGIC
=
76W + 88W + 29W + 23W + 207W + 17.5W
=
440.5 W ≈ 1500 Btu/Hr ≈ 0.1255 RT ††
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The same Example in Btu
PSERVER
PSERVERIO
PEX-MOD #1
PEX-MOD #2
PEX-(AUDIO)
PEX-LOGIC
=
Base + (6 * DSP-2) + (1 * SCM-1)
=
171 + (6 * 14) + (1 * 7)
=
171 + 84 + 7
=
262
=
Base + (2 * DSP-2) + (1 * AVB-1) + (1 * SCM-1) + (2 * SIC-4) + (3 * SOC-4) + (2 * SAC-4) + (3 * SVC-2)
=
157 + (2 * 14) + (1 * 14) + (1 * 7) + (2 * 10) + (3 * 10) + (2 * 17) + (3 * 3)
=
157 + 28 + 14 + 7 + 20 + 30 + 34 + 9
=
299
=
Base + (1 * EIC-4) + (1 * EOC-4) + (1 * EIOC-4)
=
68 + (3 * 10)
=
98
=
Base + (1 * EIC-4) + (1 * EIOC-4)
=
68 + (2 * 10)
=
88
=
(2 * Ex-IN) + (3 * Ex-OUT) + (4 * Ex-IO)
=
9 * 78
=
702
=
5 * Ex-LOGIC
5 * 12
60
PTOTAL
PTOTAL
=
PSERVER + PSERVERIO + PEX-MOD #1 + PEX-MOD #2 + PEX-(AUDIO) + PEX-LOGIC
=
262 + 299 + 98 + 68 + 702 + 60
=
1489 Btu/Hr ≈ 436.5 W ≈ 0.1244 RT
††
††
Note that the Tesira heat dissipation figures are rounded to the nearest 0.5W and nearest whole Btu, so the two examples do not
yield exactly identical results.
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Conversions
Perhaps the most common unit for HVAC (heating, ventilation and air conditioning) is British Thermal Units (abbreviated as Btu).
1 Btu is the amount of heat required to raise the temperature of 1 lb (0.454 kg) of liquid water by 1 °F (0.556 °C).
Btu/h (per hour) is most common but Btu per second, per minute or per day may also be used.
The other common measurement unit for air conditioning systems is Tons of Cooling (or Tons of Refrigeration, abbreviated as RT).
1 RT is the amount of cooling provided by melting a short ton (2,000 lbs / 907.18474 kg) of pure ice at 0°C (32°F) over 24 hours.
1 RT is approximately equal to 12,000 BTU/hour.
For air conditioning system design Btu/h is most commonly used.
If that makes you want to weep, don’t worry because the conversions are really quite simple:
Unit
Conversion
1W
=
00.0009478
BTU/Second
1W
=
00.05687
BTU/Minute
1W
=
03.412
BTU/Hour
1W
=
81.8899
BTU/Day
1Btu/h
=
00.293
Watts
1W
=
00.000285
Tons Cooling (RT)
1RT
=
3,517
Watts
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