Overview Page 55 of 906Circuit Card Description and InstallationGround Start RestrictionsIf the lineside T1 card is used in ground start mode, certain restrictions shouldbe considered. Because the system treats the lineside T1 card as a standardloop start analog line card, the ground start operation of the lineside T1 cardhas operational limitations compared to typical ground start interfaceequipment relating to start of dialing, distant end disconnect and glarepotential.• Terminal equipment goes off-hook by simulating ground on tiplead and ringing on ring lead.0 0/1 1 1Outgoing Calls (from terminal equipment):• Idle 1 1 0 1• Terminal equipment goes off-hook. 1 1 0 0• The lineside T1 simulates grounding its tip lead 0 1 0 0• Terminal equipment opens ring ground and closes loop 0 1 1 1Call Disconnect from far end:• Steady state (call in progress) 0 1 1 1• The lineside T1 ungrounds tip 1 1 1 1• Terminal equipment opens loop current 1 1 0 1Call disconnect from terminal equipment:• Steady state (call in progress) 0 1 1 1• Terminal equipment goes open loop current 0 1 0 1• Lineside T1 card opens tip ground 1 1 0 1Table 5Ground Start Call Processing A/B Bit Settings (Part 2 of 2)StateTransmit ReceiveA B A B
