Sennheiser CONFERENCE AND INFORMATION SYSTEMS SDC 3000 Specifications download pdf (Page 30)

Determining maximum cable lengths

In the preceding examples, the standard length of “3 m” is always given

for the system cables between the conference consoles. However, it is no

problem to use other cable lengths or cables of differing lengths within the

same string.

However, if you want to use longer cables, make sure that all conference

consoles – including the last one in a string – are supplied with a voltage

of at least 20 V!

Calculating the voltage drop on the system cables

Every meter of system cable and every conference console in a string

causes a voltage drop. Thus, the further back a conference console is

located in a string, the less voltage it receives. The following method is an

easy way to calculate the voltage drops on the individual sections of a

string. In this way, you know even before setting up the conference system

whether it will work or not.

The voltage drop on a cable section is calculated according to the following

formula:

Voltage drop = 4 mV x cable length x number of subsequent conference

consoles

According to this formula, for example, a system cable with a length of 10

m followed by 25 conference consoles causes a voltage drop of

4 mV x 10 m x 25 = 1.0 V

Calculate the voltage drops for all cables of your planned string and then

form the total.

Example:

25 conference consoles are connected to a central unit. The length of

the cable between the central unit and the first conference console is 80

m and the length of the cable between the conference consoles is

always 3 m.

The following voltage drops result:

80 m to the first conference console: 4 mV x80 x25 = 8,000 V

3 m between 1

and 2

conference console: 4 mV x 3 x24 = 0,288 V

3 m between 2

and 3

conference console: 4 mV x 3 x23 = 0,276 V

etc.

3 m between 24

and 25

conference console:4 mV x 3 x 1 = 0,012 V

Total of all voltage drops: 11,600 V

152 m

3 m

≤ 80 m

325

...

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 125 126

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Sennheiser CONFERENCE AND INFORMATION SYSTEMS SDC 3000 Specifications Page 30

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