Allied Telesis AR Series Hardware Reference Manual page 80

80
Figure 49: DB9 male loopback plug for testing asynchronous ports with DB9
female connectors.
DB9 Male Asynchronous Port Loopback Plug (DB9 female connector)
1
2
3
4
5
6
7
8
9
Figure 50: Ethernet AUI loopback plug.
AUI Loopback Plug (Female D15 connector)
1
2
3
4
5
6
7
8
9
10
11
12
13
R1
14
15
Figure 51: Ethernet twisted pair (TP) loopback plug.
Twisted Pair (TP) Loopback Plug (RJ45 connector)
TX+ 1
TX- 2
RX+ 3
4
Not
5 connected
RX- 6 Not
7
connected
8 •Not
Pin 5 Pin 1
Pin 9 Pin 6
DB9 Female — Pin View
C1 = 100nF ceramic capacitor
C1
C2 = 100nF ceramic capacitor
R1 = 1K resistor
C2 Note
LED
The LED and resistor provide
optional power feed checking.
They are not required for
loopback testing.
8 7 6
Switch or router
end view
AR Router
DB9FLOOP
AUILOOP
5 4 3 2 1
TPLOOP
C613-03031-01 REV C