AT&T 1987 AT&T Telephone User Manual


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Port Specifications (Contd)
TRUNK PORTS
TRUNK TYPE
CIRCUIT PACK
SPECIFICATIONS
Ground Start
ZTN76
● Capacity: 8 Circuits
Trunk
● 2-Wire (600 Ohms or RC
Balance) Transmission
● Network Signaling: Ground
Start
● Two-way or Incoming only
Service
Loop Start
ZTN77
● Capacity: 8 Circuits
Trunk
● 2-Wire (600 Ohms or RC
Balance) Transmission
● Network Signaling: Loop
Start
● Two-way or Incoming only
Service
5-15
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