Hardware Reference
91
C613-03031-01 REV E
Figure 53: DB9 male loopback plug for testing asynchronous ports with DB9
female connectors.
Figure 54: Ethernet AUI loopback plug.
Figure 55: Ethernet twisted pair (TP) loopback plug.
DB9 Male Asynchronous Port Loopback Plug (DB9 female connector)
1
2
3
4
5
6
7
8
9
DB9FLOOP
Pin 9
Pin 6
Pin 5
Pin 1
DB9 Female — Pin View
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
C1 = 100nF ceramic capacitor
C2 = 100nF ceramic capacitor
R1 = 1K resistor
C1
C2
LED
R1
AUI Loopback Plug (Female D15 connector)
Note
The LED and resistor provide
optional power feed checking.
They are not required for
loopback testing.
AUILOOP
Not
connected
Not
connected
•Not
Twisted Pair (TP) Loopback Plug (RJ45 connector)
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Switch or router
end view
TX+
TX-
RX+
RX-
TPLOOP
