Hot-Line Interface Card: (Part No. VCL-MX-1525HTL-16-5.0)
Number of channels per card 16
Maximum number of interface cards 9
Maximum number of channels 144
Interface type
Hot-Line
A-law, 8 bit/sample, A=87.6 / 87.7, 13 segment coding
Transmission performance Fully compliant to ITU (CCITT) G.712 specification
Line Impedance
600Ω (900Ω optional)
Loop resistance Upto 2000 Ohms
Voice channel frequency 300Hz-3400Hz
Insertion loss / gain
-2.0 dB Nominal (user adjustable)
Adjustable range –30 dB to +3 dB in steps of 0.5 dB
User selectable range for gain /
insertion loss
0 dB to 18 dB
Idle channel noise
≤ -65 dB
Return loss
300Hz – 600Hz - ≥ 12 dB
600Hz – 3400Hz - ≥ 15 dB
Longitudinal balance ≥ 46 dB between 300Hz to 3400Hz
Ring frequency 16 Hz, 20 Hz , 25 Hz, 50 Hz
Ring voltage
≥ 75 volts RMS into a load of 5 R.E.N. with a 0.30 Erlang
traffic pattern
Subscriber loop current ≥ 30mA into a subscriber loop of 1200 Ohms
Overload level +3.14 dBm ± 0.5 dBm
Dialing Ring-down
E&M 2 Wire / 4 Wire Voice Frequency Interface (Part No. VCL-MX-1535-08-5.0)
Number of channels per card 8
Maximum number of interface cards 9
Maximum number of channels 72
Interface type
2W / 4W E&M, Type II and Type V
A-law, 8 bit/sample, A=87.6 / 87.7, 13 segment coding
Transmission performance Fully compliant to ITU (CCITT) G.712 specifications
Line impedance
600Ω (900Ω optional)
Voice channel frequency 300Hz-3400Hz
Insertion loss / gain
-2.0 dB Nominal (user adjustable)
Adjustable range –30 dB to +7.5 dB in steps of 0.5 dB
User selectable range for gain /
insertion loss
0 dB to 18 dB
Idle channel noise < 65 dB
Return loss
300Hz – 600Hz - ≥ 12 dB
600Hz – 3400Hz - ≥ 15 dB
Longitudinal balance ≥ 46 dB between 300Hz to 3400Hz
Dial pulse speed 50 pps – Pulse Dialing ≤ ± 2 ms / DTMF Dialing