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Analog Transmission Characteristics (Contd)
Sampling Rate:
8 kHz
Terminating Impedance:
600 ohms
Trunk Balance Impedance:
600 ohms or Complex Z (selectable)
Echo Return Loss:
The echo return loss of the switching equipment is infinite. The echo return loss of the
station equipment can be engineered for greater than 18 db over the range of 500 Hz to
2500 HZ.
Loop Resistance:
● TN74.2—Loop resistance of up to 1300 ohms, including the station
● ZTN78—Loop resistance of up to 100 ohms not including the station
(2000 feet with No. 24 AWG.)
Connection Bandwidth: 64 Kbits
Steady State Noise Level:
The steady state noise level presented to any busy path does not exceed 23 dBrnc during
the busy hour.
Impulse Noise:
The impulse noise is 0 count (hits) in five minutes at +55 dBrnc during the busy hour.
Single Frequency Return Loss (Talking State):
Station to station—exceeds 12 db
Station to 4 wire trunk connection—exceeds 14 db
Station to 2 wire trunk connection—exceeds 12 db
Peak Noise Level:
Analog to analog—20 dBrnc
Analog to digital—19 dBrnc
Digital to analog—13 dBrnc
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