Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 42

42
Figure 29: Ethernet AUI loopback plug
AUI Loopback Plug (Female D15 connector)
1
2
3
C1
4
5
6
7
8
9
10
11 C2
12
13
R1
14
15
Figure 30: 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
Figure 31: Primary Rate ISDN loopback plug
PRI Loopback Plug (RJ45 connector)
TX+
1
TX-
2
3
RX+
4
RX-
5
6
7
8
C1 = 100nF ceramic capacitor
C2 = 100nF ceramic capacitor
R1 = 1K resistor
Note
LED
The LED and resistor provide
optional power feed checking.
They are not required for
loopback testing.
8 7 6 5 4
End view
of plug
8 7 6 5 4
Switch or router
end view
Port Interface Card
AUILOOP
3 2 1
TPLOOP
3 2 1
P120LOOP
C613-03023-00 REV J