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Power Requirements: CELP assembly
Telephone Interface (4-wire/E&M)
Impedance
Return Loss
Longitudinal Balance
Usable Audio Bandwidth
Idle Channel Noise
Transmission Levels
Transmit Section:
Nominal Input Level
Input Adjustments (around nominal
in put level)
Receive Section
Nominal Output Level
Output Adjustments
Data Rates
Multiplexer
M-Lead Input Characteristics
U.S. E&M (Types I-V)
M-Lead Input Resistance
Threshold Currents
Idle
Busy
U.K. SSDC5A
E-Lead Output Characteristics
Idle leakage Current
Max "on" voltage
APPENDIX A
TECHNICAL CHARACTERISTICS
Electrical
+ 5 V dc ±5%, .70 A, typical, 1.0 A maximum, 3.50 W, typical
+ 12 V dc ±10%, 7 mA, typical, 10 mA, maximum, 0.084 W, typical
– 12 V dc ±10%, 30 mA, typical, 40 mA, maximum, 0.36 W, typical
600-ohms resistive
18 dB minimum, (300-3400 Hz)
56 dB minimum, (300-3400 Hz)
300-3400 Hz
Less than –65 dBm0p at 6.4 and 4.8 kHz.
–16 dBm or 0 dBm (switch selectable)
–6 dB to +1.5 dB in 0.5-dB steps. Adjustments made by DIP switch.
0 dBm or +7 dBm (switch selectable)
– 6 dB to +1.5 dB in 0.5-dB steps. Adjustments made in software.
9.6, 6.4 or 4.8 kHz
2.4 kilohms (approximately)
1 mA or less (M-lead to station ground)
2.0 mA or greater (M-lead to station ground)
An earth via resistance of up to 1500 ohms in parallel with a capacitor of 1 micro-
farad ±10% applied to the M-lead draws a minimum of 5 mA and is recognized as a
Busy condition.
An earth via resistance of greater than 400-kilohms in parallel with a capacitor of
1 microfarad ±10% applied to the M-Lead is recognized as an Idle condition.
500 microamps maximum at 64 V
2.0 V at 5 mA
2.5 V at 50 mA
Specifications
A-1
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