\
NPE
❘
●
ON-BOARD
MICRO-
PROCESSOR
T.O
PORT
I/O
CIRCUIT
GROUND
DETECTOR
PORT
CIRCUIT
0
R.O
T1.0
R1.O
E.O
●
M.0
❘
❘
❘
●
T.3
R.3
PORT
T1.3
CIRCUIT
R1.3
3
E.3
M.3
/
Figure 3-16. Unique Tie Trunk (TN760B) Circuitry
TO
TIE
TRUNKS
UNPROT .
0000
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
Figure 3-17. Tie Trunk (TN760B) Circuit Pack Option Switches
3-33