AT&T System 25 - Manual (Page 106)

INSTALLATION
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Connect a 25-pair plug on octopus cable to the SIP receptacle on
the ETU.
Mount the octopus cable on the 50A Fanning Strip (Figure 2-31).
Connect all eight legs of the octopus cable to adapters (port side) at
the SIP. The first five stations (legs 1 through 5) are the Power
Failure Transfer stations.
Document the connections on the Voice and Data Station Record
Form (Figure 2-26).
Connect ETUs (Optional)
For systems having three or four ETUs connect ETU 1 to ETU 3
using a D8W-87 cord. Plug one end into the modular jack labeled
ADDITIONAL ETU on ETU 1 and the other end into the modular jack
labeled SWITCH (cpu) on ETU 3. Connect ETUs2 and 4 the same
way.
Connect External Alarm (Optional)
Connect the external alarm (if required) to the two screw
terminations labeled EXTERNAL ALARM on the upper right of the
ETU.
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