Loopback Plugs For Testing Interfaces - Allied Telesis AR Series Hardware Reference Manual

Hardware Reference
C613-03031-01 REV E
Voice Ports and Adaptor Cables
Voice ports use a standard RJ11 connector. To connect telephones with a BT-
style connector, use an RJ11-to-BT adaptor cable (Figure 50 on page 89).
Figure 50: Pin wiring diagram for an RJ11 to BT adaptor cable.
RJ11 Plug
3
4
5
Pin 1 Pin 6
RJ11 — Router end view
Notes:
(1) The SHUNT line (RJ11 pin 5/BT jack pin 3) is only required by some phones. If not
connected they will not ring.

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 (hence loopback
plug) 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.
Table 38 on page 90 lists the loopback plug wiring diagrams for each interface
type.
5
2
3
Cable
Pin 6
BT Socket — Pin view
89
BT Socket
Pin 1
RJ11BT