User Manual
SUPM1
page 49 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
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Functional Description
5.9 Line Feeding
The analogue a/b-wires of SUPM1 are fed with a line feed current, the loop
current.
This is the current a subscriber will draw from the interface during off-hook.
Since the interface behaves as a constant current source it is possible to
define the value of this constant current (= maximum loop current) in the
range from 15.0 mA up to 45 mA.
In the V5CAS mode of operation the line feeding of a blocked port can be
enabled or disabled. In the MCAS mode of operation the line feeding is
always enabled.
Keep the loop current as low as possible to reduce the local power dissipa-
tion on the SUPM1. For most applications the default loop current 23.5 mA is
sufficient.
When operating the SUPM1 unit in a passively cooled subrack the loop cur-
rent is limited to 23.5 mA
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