Siemens Hicom 150 E Office - Connection Via ET;A Adapter Box

Figure 10-12 Contact assignment for available voice modules
10.4.4 Connection via ET/A adapter box
Depending on the functions desired, the entrance telephone can be connected via an entrance
telephone adapter box with amplifier (ET/A) adapter box
(S30817-Q936-A313 with starting contact).
For the a/b interface, the a-wire must always be negative and the b-wire must always be
positive.
Hicom 150 E Office Rel.1.0 Service Manual - 10 Special equipment
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