4
Balanced wiring - The convention for balanced wiring (2-core plus shield) is shown here:
Unbalanced wiring - The convention for unbalanced wiring to the inputs (1-core plus
shield) is shown here:
Unbalanced cable
Shield
Hot
Link between
pins (S) and (-)
(optional for inputs)
Telephone Headset – RJ-22 Jack
The BLU-HIF features an RJ-22 jack for connection to the headset jack of a VoIP/digital
phone. See Figure 1 for a system connection diagram using the telephone headset RJ-22
jack. The wiring configuration within the headset jack of a VoIP/digital phone often differs,
depending on the manufacturer. The BLU-HIF comes with two cables whose 4P4C RJ-22
connectors are compatible with the two most common wiring configurations found in the
headset jack of VoIP/digital phones. See Figure 3 for the BLU-HIF internal wiring diagram.
Caution:
before connecting to the RJ-22 jack, ensure that the internal jumper is set to
the appropriate position. Do not connect to both Telephone Headset jacks (RJ-22 and
2.5mm) on the BLU-HIF simultaneously. Doing so risks damaging the connected devices.
By default, the BLU-HIF ships with the jumper set to the Telephone Headset RJ-22 jack
position. See Figure 5 for an internal jumper configuration diagram.
Balanced cable
Shield
Hot
Cold
