# Signaling module electrical specifications

## Common specifications (United States version)

The following specifications apply to Part Numbers 5399, 5593, 5551, and 5549 rev D.1 and higher:

Specification | Line interface type
--- | ---
| Loop start | Subscriber loop | DID
Connectors | 1 four-ganged, four-position modular connector (4 RJ-14x jacks). | 1 four-ganged, four-position modular connector (4 RJ-14x jacks). | 1 four-ganged, four-position modular connector (4 RJ-14x jacks).
Return loss (ref. 600 Ohms +2.2 uF standard) | 20 dB min. (ERL) | 20 dB min. (ERL) | 20 dB min. (ERL)
Four to two wire gain Tolerance | +/- 1 dB | +/- 1 dB | +/- 1 dB
Four to two wire gain range | +6 to -6 dB | +6 to -6 dB | +6 to -6 dB
Two to four wire gain tolerance | +/- 1 dB | +/- 1 dB | +/- 1 dB
Two to four wire gain range | +6 to -6 dB | +6 to -6 dB | +6 to -6 dB
Frequency response 300 Hz - 3200 Hz. Reference to 1 kHz | +/- .8 dB | +/- 1 dB | +/- 1 dB
Trans-hybrid loss | 17 dB min. @ 300 Hz-3.0 kHz into 600 Ohms + 2.2 uF | 17 dB min. @ 300 Hz-2.5 kHz into 600 Ohms + 2.2 uF | 17 dB min. @ 300 Hz-2.5 kHz into 600 Ohms + 2.2 uF
Signal overload level | +3 dBm at 0 dB gain | +3 dBm at 0 dB gain | +3 dBm at 0 dB gain
CMRR | > 80 dB | > 50 dB | > 50 dB
T-R input impedance (300 - 3200 Hz) | Voice band 600 Ohms +2.2 uF standard | 600 Ohms +2.2 uF standard | 600 Ohms +2.2 uF standard
Idle channel noise through connection | < 20 dB rnC | < 20 dB rnC | < 20 dB rnC
Crosstalk transmit to receive channels | < -70 dB @ 1 kHz | < -70 dB @ 1 kHz | < -70 dB @ 1 kHz
T-R isolation to SELV | >1500VRMS | Not applicable. | Not applicable.
Off-hook detect | Guaranteed Detect: Current > 10 mA Guaranteed No Detect: Current < 3.3 mA | Guaranteed Detect: Current > 13 mA Guaranteed No Detect: Current < 7 mA | Guaranteed Detect: Current > 13 mA Guaranteed No Detect: Current < 7 mA
Operating loop current | 18 mA to 70 mA | 13 mA to 31 mA | 13 mA to 31 mA
Loop current and polarity detect | Single bit indicates if the current is flowing from Tip to Ring or Ring to Tip. | Not applicable. | Not applicable.
Ring detection | Guaranteed Detect: 30 VRMS 17 - 33 Hz (US version) Guaranteed No Detect: No detect <15 VRMS (0 - 5 kHz) | Not applicable. | Not applicable.
Maximum cable distance: | Not applicable. |  |
At 48 V, 24 AWG |  | 18,000 feet (5 km) (1800 Ohms) | 18,000 feet (5 km) (1800 Ohms)
At 30 V, 24 AWG |  | 2,000 feet (600 m) (600 Ohms) | Not applicable.
Maximum ringer equivalence load | Not applicable. | 1.5 | Not applicable.

European models change only where required to conform to regulation TBR21 (loop start only). For example, T-R input impedance is 270 Ohms in series with a parallel combination of 750 Ohms and 150 uF.