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11-20 Voice Cards
Model No.
Running Head
E&M Card Specifications E&M Card
11.5 E&M Card Specifications
E&M Cards (E&M-2W-8P and E&M-4W-8P)
Physical Interface (Models
EM-2W-8P and EM-4W-8P)
Number of Ports 8
Connectors 1 female 50-pin telco connector
Transmission Performance
Performance Exceeds requirements of ITU-T G.712 (4-wire) and IT-T G.713 (2-wire)
Signaling
Signaling Types Switch selectable per card
Types I, II, IV and V
Normal (toward user) and Trunk/Tandem (toward CO)
Signal Modes Software selectable per port
Transmit Only (to)
Standard Type I, II, IV or V E&M (e&m)
Symmetrical R2 signaling (e&mr2)
Modified R2 (r2mod)
VF Transmission Characteristics
Nominal Transmit TLP Software selectable
Model 8108 -16.5 dB to +7.3 dB in steps of 0.1 dB
Model 8115 and 8119 -17.5 dB to +14.5 dB in steps of 0.1 dB
Nominal Receive TLP Software selectable
All Models -16.3 dB to +7.5 dB in steps of 0.1 dB
Termination Impedance with 2.16
µ
f capacitor in series 600 Ohms
PCM Encoding Software selectable
µ
-law
A-law
A-law bit inverted
Attenuation Versus Frequency as per AT&T TR43801 - Relative to 1 kHz with 0 dBm0 input
Frequency Transmit (A to D) Receive (D to A)
200 Hz -0.25 to +3.0 dB -0.25 to +2.0 dB
300 to 3000 Hz -0.25 to +0.5 dB -0.25 to +0.5 dB
3200 Hz 0.25 to +0.75 dB -0.25 to +0.75 dB
3400 Hz -0.25 to +1.5 dB -0.25 to +1.5 dB
Return Loss Against 600 Ohms, in series with 2.6
µ
f with additional 25 Ohms
resistor between the channel unit and the return loss measurement set.
Model E&M-2W-8P 2-wire Echo 28dB min.
Singing 20dB min.
Model E&M-4W-8P 4-wire 1kHz 28dB min.
300 to 3000 Hz 23dB min.
4W Return Loss (at 1 kHz) >20dB Typical > 27dB
2W Return Loss (at 1 kHz) >15dB Typical> 20dB