5.1.2 Connection
Connection between the PBX and a PT:

CAUSE

The T/R is connected to the D1/D2.

SOLUTION

No

Can you dial
an extension? Use the correct cord (the
inner 2 wires are for T/R and
the outer 2 wires are for
D1/D2)
D1
T
R
D2
D1
T
R
D2
PBX Extension
Connection between the PBX and an SLT:

CAUSE SOLUTION

If a telephone equipped
with an A-A1 relay is
connected to the PBX, set
the A-A1 relay switch of the
telephone to "OFF".
Use the correct cord (the
inner 2 wires are for T/R).
PBX
The T/R is connected to the D1/D2.
D1
T
R
D2
T
R
Extension
Connection between the PBX and an SLT that is polarity-sensitive:
PBX

CAUSE

The "T" is connected to the "R".

SOLUTION

D1
T
R
D2
T
R
Extension
Reverse the connections of
the T/R.
(Continued on the next page.)

Yes

Document Version 2011-10 Installation Manual 123
5.1.2 Connection