Specifications

34 AR400 Series Router
C613-03086-00 REV A
Figure 1-15: Pin wiring diagram for a Macintosh serial cable.
Loopback plugs for testing interfaces
Loopback plugs are used in conjunction with the Test Facility software (see the
Test Facility chapter) to test the router’s physical interfaces. The purpose of a
loopback plug is to connect the output pins on the interface to the input pins so
that any data transmitted over the interface is looped back and received at the
same interface.
On interfaces with control signals, these are also looped back. The data
received on the interface is compared with the data transmitted to determine
whether or not the interface is functioning correctly. In order to produce a
comprehensive test report, most tests performed by the Test Facility require a
loopback plug to be inserted in the interface being tested.
Some interfaces (e.g., the synchronous ports) require a specially built external
testing device (available from your authorised Allied Telesyn distributor or
reseller) to be used in conjunction with the Test Facility.
The following table lists loopback plug wiring diagrams for each interface
type.
Table 1-13: Loopback plug pin wiring diagrams.
Physical Interface Loopback Method/Pin Wiring Diagram
RJ-45 asynchronous interface Figure 1-16 on page -35
DB9 Male Figure 1-17 on page -35
DB9 Female Figure 1-18 on page -35
Ethernet TP interface Figure 1-18 on page -35
RJ45
(to switch or router)
MiniDin
(to Macintosh)
1
2
3
4
5
6
7
8
←
→
←
→
←
→
(RING)
(DCD)
(RTS)
(RXD)
(GND)
(TXD)
(CTS)
(DTR)
Not connected
Notes:
(1) → Output from switch or router; ← Input to switch or router.
(2) Cable version 1.0.
MINIDIN
1
2
8
5
4
6
7
3