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Station Apparatus
3000-series Telephone Option PCBs
Strata CTX I&M 06/04 11-7
Station Apparatus
Telephone Headset (BHEU) Upgrade
The BHEU can be installed into the DKT3000-series telephones to enable headset or external
ringer use. For information on connecting the external ringer, refer to “Telephone (BHEU) to
External Speaker (HESB) Cable Connection” on page 12-18. The BHEU can also be installed into
DKT3010 and DKT3020 telephones that have either a BVSU or BPCI installed. For DKT3001
and DKT3014 telephones, the installation is same as below, only the connector location is
different.
BHEU Installation
1. Loosen the four captive screws
on the telephone base, and
remove the base. Knock out hole
for the BHEU cord (see Figure
11-2).
2. If you are connecting an ECM or
Carbon-type headset to the
BHEU, leave the BHEU jumper
in the “AUTO” position (see
Figure 11-4).
“AUTO” enables the BHEU
current detector to determine
which headset type is connected
(less than 2mA detects EMC and
more than 2mA detects Carbon).
If, in a rare case the current is
marginal using a carbon headset
(only) and performance is not
adequate, set the jumper to
“CARBON.”
BHEU1A
P1
SW1
SW2
AUTO
CARBON NORMAL
LOW
RED
Transmission Level
Headset Modular
Connector
5502
Figure 11-4 BHEU PCB