Keymile SUPM1 - Power Consumption

User Manual
SUPM1
page 25 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functions and Specifications
3.9 Power Consumption
Please note:
When operating the SUPM1 unit in a passively cooled subrack the loop cur-
rent is limited to 23.5 mA
The differentiation between short loop and long loop is the loop voltage, i.e.
loop resistance x loop current. The indicative loop resistance for the short
loop with the different loop currents is defined as follows:
•R
LOOP
< 1400 Ω @ I
LOOP
= 15.0 mA
•R
LOOP
< 1100 Ω @ I
LOOP
= 19.5 mA
•R
LOOP
< 900 Ω @ I
LOOP
= 23.5 mA
•R
LOOP
< 600 Ω @ I
LOOP
= 30 mA
•R
LOOP
< 500 Ω @ I
LOOP
= 39 mA
•R
LOOP
< 400 Ω @ I
LOOP
= 45 mA
The table below shows the power consumption of the SUPM1 unit with a
load of 0.1 Erlang, i.e. with 2 active subscribers.
Table 25: Power consumption, V
BAT
= -48 V
I
Loop
[mA] Loop length Off-hook [n] I
VBAT
[A] P
TOT
[W]
- - 0 0.12 6.0
15 short 16 0.25 16.8
19.5 short 16 0.4 19.2
23.5 short 16 0.45 21.6
30 short 16 0.52 25.0
39 short 16 0.65 31.2
45 short 16 0.7 33.6
15 long 16 0.5 24.0
19.5 long 16 0.6 28.8
23.5 long 16 0.7 33.6
30 long 16 0.85 40.8
39 long 16 1.0 48.0
45 long 16 1.2 57.6
Table 26: Power consumption @ 0.1 Erlang, V
BAT
= -48 V
I
Loop
[mA] Loop length Off-hook [n] I
VBAT
[A] P
TOT
[W]
15 short 2 0.14 6.7
19.5 short 2 0.15 7.2
23.5 short 2 0.16 7.7
30 short 2 0.17 8.2
39 short 2 0.18 8.6
45 short 2 0.19 9.1
15 long 2 0.17 8.2
19.5 long 2 0.18 8.6
23.5 long 2 0.19 9.1
30 long 2 0.22 10.6