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CHAPTER 3 NDA-24296
Page 548
Revision 1.0
PA-4AMPC
AMP Pool Trunk
PA-4AMPC
AMP Pool Trunk
1. General Function
This circuit card is bidirectional amplifier circuitry to be used for such a purpose as level guaranteeing in
a public line—tie line connection. The circuit card is provided with four bidirectional amplifier circuits and
controls gains to speech loss which may vary with the kind of line involved in the connection. Also, this
circuit card is provided with the function to disable the AGC when modem signals such as FAX signals
have arrived.
Figure 3-168 Location of PA-4AMPC (4AMP) within the System
AGC
Fix AMP
C.O. Trunk
ECa
PA-4AMPC
Tie Line N.W
Tie Line Trunk
TSW
ECa:
ECb:
AGC:
FixAMP:
Echo Canceller which suppresses echo
in the hybrid circuit of a C.O. trunk.
Echo Canceller which suppresses echo
in the tie-line side.
Automatic Gain Control circuit (amplifies
voice signals arriving from the public
network.)
voice signals arriving from the tie-line
network.)
Public N.W
ECb
PAD
Fixed Gain Amplifier Circuit (amplifies
voice signals arriving from the public
network)
Fixed Gain Amplifier Circuit (amplifies
PAD: