Bell System Practices 851 Identification, Installation, Connections, And Maintenance page 7

Fig . 9-Connector Cable and D-180375 Kit of Parts
(Early Version)
Fig. 10-Exlusion Switch Installed and Hinged Chassis
Mounting Screws (Early Version)
the positions involved and making the
necessary wiring change (Table C).
• Lamp and set wiring are provided for
illuminating all key positions, except in the
ISS 8, SECTION 503-601-101
Fig. 11-Polarity Guard Position
Fig. 12-Dial Adapter Bracket
hold position (lamp must be furnished
separately) where the associated lamp leads
are insulated and stored.
• Line appearances on the key can be rearranged
by switching the color coded plugs on the
rear of the key or rearrangement of the
cross connections at the key equipment.
• If multiline conferencing option is provided
the 635A5 key must be replaced with 635CF5
key, and a 2Al matrix block shall be added
to the equipment (Table E), in place of
polarity guard described in paragraph 3.11.
This unit provides eight polarity guard
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