Filter
Top Products
CHAPTER 3 NDA-24296
Page 292
Revision 1.0
PA-CS33
Attendant Interface
Calculation of the distance between the ATI circuit card and Modular Rosette
The distance M in the figure above is determined according to the Direct-Current resistance of power
supply cables (-48V and GND). Note that the maximum resistance is 26 Ω as shown in the following
formula:
m = a + b + c 26Ω
m: Maximum Direct-Current resistance between the ATI circuit card and Modular Rosette
a: Direct-Current resistance of power supply cables (-48V and GND) in the range of A
b: Direct-Current resistance of power supply cables (-48V and GND) in the range of B
c: Direct-Current resistance of power supply cables (-48V and GND) in the range of C
Example of Calculation
a, b, and c are calculated by the following formulae:
Note:
You are not required to use cable lengths in meters in the following formulae. You may use cable lengths in
feet, yards, or whatever units you prefer. However, the units of resistance you use must match the units of
length you use. For example, if you use distance in feet, you must also use DC resistance per foot.
Cable resistance of DC -48V cables Cable resistance on GND cables
u (Ω/m) × x (m) u (Ω/m) × x (m)
a = +
21
No. of DC -48V cablesNo. of GND cables
Cable resistance of DC -48V cables Cable resistance on GND cables
v (Ω/m) × y (m) v (Ω/m) × y (m)
b = +
22
No. of DC -48V cablesNo. of GND cables
Cable resistance of DC -48V cables Cable resistance on GND cables
w (Ω/m) × z (m) w (Ω/m) × z (m)
c = +
22
No. of DC -48V cablesNo. of GND cables
u: DC resistance per meter in the range of A (Ω/m)
v: DC resistance per meter in the range of B (Ω/m)
w: DC resistance per meter in the range of C (Ω/m)
x: Cable length (m) in the range of A
y: Cable length (m) in the range of B
z: Cable length (m) in the range of C
<
=