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 |
|
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R1.3 |
|
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E.3 |
|
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M.3 |
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|
/
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 |
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| PORT 3 |
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| PORT 2 |
|
| PORT 1 |
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E&M | E&M | E&M |
|
| E&M |
/