Allied Telesis AR Series Hardware Reference Manual page 79

Hardware Reference
C613-03031-01 REV C
Table 35: Loopback plug pin wiring diagrams.
Physical Interface
RJ-45 asynchronous interface
DB9 Male
DB9 Female
Ethernet AUI interface
Ethernet TP interface
Basic Rate ISDN interface
Primary Rate 75Ω interface
Primary Rate 120Ω interface
Figure 47: RJ-45 loopback plug for testing asynchronous interfaces.
RJ45 Asynchronous Port Loopback Plug (RJ45 connector)
(RING) 1
(DCD) 2
(DTR) 3
(GND) 4
(RXD) 5
(TXD) 6
(CTS) 7
(RTS) 8
Figure 48: DB9 female loopback plug for testing asynchronous ports with DB9
male connectors.
DB9 Male Asynchronous Port Loopback Plug (DB9 female connector)
1
2
3
4
5
6
7
8
9
Loopback Method/Pin Wiring Diagram
Figure 47 on page 79
Figure 48 on page 79
Figure 49 on page 80
Figure 50 on page 80
Figure 51 on page 80
Figure 53 on page 82. Most BRI interfaces are
tested without a loopback plug. See "Loopback
Plugs for BRI Interfaces" on page 81 for
instructions on how to determine if a loopback
plug is required.
Use a length of terminated cable as a loopback
cable on the interface.
Figure 52 on page 81
8 7 6 5 4 3 2
Router end view
of plug
Pin 5 Pin 1
Pin 9 Pin 6
DB9 Female — Pin View
79
1
RJ45LOOP
DB9FLOOP