AT&T System 25 - Manual (Page 353)

APPENDIX E: Administration Codes and Data
Table E-S. Applicable Options
See WARNING for Table E-R. Also note that a bullet in a box on this
table indicates that the default value for that action (shown in Table E-R)
is applicable for this circuit board. No bullet indicates that the option is
●
Timing adjustable for internal calls only.
† ACTION 35 (Hybrid Balance) defaults depend on board
Trunk Ports are defaulted to 0 (Resistor/Capacitor
type.
termination), while Station Ports are defaulted to 1 (Resistor
termination).
E-34