
NPE
MICRO-
PROCESSOR
PORT
I/O
CIRCUIT
GROUND
DETECTOR
●
●
●
PORT
CIRCUIT
0
❘
❘
❘
❘
PORT
CIRCUIT
3
\
T.O
R.O
T1.0
R1.O
E.O
M.0
  | 
  | TO  | 
T.3  | 
  | TIE  | 
R.3  | 
  | TRUNKS  | 
  | 
  | |
T1.3  | 
  | 
  | 
R1.3  | 
  | 
  | 
E.3  | 
  | 
  | 
M.3  | 
  | 
  | 
  | 
  | 
  | 
/
Figure 3-16.  Unique Tie Trunk (TN760B) Circuitry
UNPROT .
0 0 0 0
0 0 0 0
PORT: 4 3 2 1
PROT .
SMPLX  | SMPLX  | SMPLX  | 
  | SMPLX  | ||||||||
  | 
  | PORT 4  | 
  | 
  | PORT 3  | 
  | 
  | 
  | PORT 2  | 
  | 
  | PORT 1  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | ||||
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | ||||
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
E&M  | E&M  | E&M  | 
  | 
  | E&M  | |||||||
/