User Manual
SUPM1
page 16 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functions and Specifications
3.5 Signalling Specification
Table 6: Signalling specification - DC loop feeding
Feature Rating or standard
On-hook voltage unloaded
@ V
BAT
= -39.5 … -60.0 V
DC
U
ONHOOK
= -53 … -59 V
@ V
BAT
= -60.0 … -72 V
DC
| U
ONHOOK
| =
| V
BAT
– 2 V | ± 3 V
On-hook voltage
@ I
LOOP
= 2.0 mA | U
ONHOOK
| ≥ 44 V
On-hook voltage
@ I
LOOP
= 5.0 mA | U
ONHOOK
| ≥ 44 V
Maximum on-hook loop current I
LOOP
≤ 5 mA
Loop current Constant current feeding
Selectable loop currents
a
15.0 mA, ± 10%
19.5 mA, ± 10%
23.5 mA, ± 10%
30.0 mA, ± 10%
39.0 mA, ± 10%
45.0 mA, ± 10%
Normal polarity a-wire is more positive than b-wire.
a-wire is close to GND but still negative.
Maximum loop resistance 2 kΩ including the terminal.
This fulfils the requirements of a long haul interface.
Off-hook detection @ default loop current (23.5 mA) I
LOOP
≥ 15 mA
On-hook detection I
LOOP
≤ 7 mA
a. When operating the SUPM1 unit in a passively cooled subrack the loop current is limited to 23.5 mA.
Table 7: Signalling specification - off-hook detection timing
Feature Rating or standard
Safe detection
No detection
t
line
≥ 20 ms
t
line
< 15 ms
If a wake up signal, e.g. a polarity reversal, is sent out to initiate CLIP, the terminal will draw a short current pulse which
can be interpreted by the SUPM1 as an off-hook event. So the detection time for off-hook has to be increased to prevent
this false off-hook detection to ≥ 200 ms.
In the V5CAS mode of operation, the off-hook timing parameter is configured in the CPS of the VOIP1 unit as the Con-
nect Timeout parameter (HS1.3).
In the MCAS mode of operation the off-hook detection time is predefined to 200 ms in the SUPM1.
Table 8: Signalling specification - reduced battery
Feature Rating or standard
During the “reduced battery” state, the loop current is reduced to a predefined level. This level is set to a value that still
ensures a correct on-hook/off-hook detection.
Minimum loop current 15 mA
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