Avaya Nortel Communication Server 1000 Reference page 54

Overview
Ringing is applied from Lineside T1 card by simulating ground
on tip lead and ringing on ring lead.
Terminal equipment goes off-hook by simulating ground on tip
lead and ringing on ring lead.
Outgoing Calls (from terminal equipment):
Idle
Terminal equipment goes off-hook.
The Lineside T1 simulates grounding its tip lead
Terminal equipment opens ring ground and closes loop
Call Disconnect from far end:
Steady state (call in progress)
The Lineside T1 ungrounds tip
Terminal equipment opens loop current
Call disconnect from terminal equipment:
Steady state (call in progress)
Terminal equipment goes open loop current
Lineside T1 card opens tip ground
Ground Start Restrictions
If the Lineside T1 card is used in ground start mode, certain restrictions should be considered.
Because the system treats the Lineside T1 card as a standard loop start analog line card, the
ground start operation of the Lineside T1 card has operational limitations compared to typical
ground start interface equipment relating to start of dialing, distant end disconnect and glare
potential.
Distant end disconnect restrictions
If the SAL feature is not available in the CS 1000 software, the Lineside T1 card is not capable
of indicating to the Customer Premise Equipment (CPE) when a call is terminated by the distant
end. In this case, the Lineside T1 card continues to provide a grounded tip indication (A=0) to
the CPE until it detects an open loop indication (A=0) from the CPE, at which time it provides
an open tip indication (A=1). Therefore, without SAL software, the Lineside T1 card is not
capable of initiating the termination of a call to the CPE.
54 Circuit Card Reference
State
Comments? infodev@avaya.com
Transmit Receive
A B A B
0 0/1 0 1
0 0/1 1 1
1 1 0 1
1 1 0 0
0 1 0 0
0 1 1 1
0 1 1 1
1 1 1 1
1 1 0 1
0 1 1 1
0 1 0 1
1 1 0 1
July 2011