Specifications

Line Programming
DXP Correspondence Manual
8.23
DID Options
DID/DNIS Block Name
Choose a 7-character name to associate with each DID/DNIS block.
DID Control Signaling
I
Decide upon which address supervision signaling protocol that you
will use. This decision will depend upon the type of supervision that is
compatible with the CO requirements.
Immediate Start: Use this protocol for rotary (pulse dial) lines. With
this protocol, the CO will not expect address supervision signaling and
may begin pulsing the dialing digits as soon as 65 msec. after it
connects to the line.
Wink Start: With this protocol, the CO will expect address
supervision signaling. After the CO connects to the line, the DXP will
reverse the polarity of the line for a period of 200 msec when it is
ready to receive digits (that is, the DTMF receiver is available for tone
dial lines). This “wink” signal indicates to the CO that the DXP is
ready to receive incoming digits. After the wink occurs and the line
polarity returns to normal, the CO will begin sending the dialing
digits. If the CO does not see the wink within 4 to 8 seconds (heavy
traffic timings), it may route the call to network reorder or retry the
call on another line. Typically, a CO will try to dial two times. A
second failure will result in network reorder. Wink start protocol is the
best choice for its combination of integrity checks and retrial
capabilities.
Delay Start: With this protocol, the CO will expect address
supervision signaling. Approximately 100 msec. after the CO connects
to the line, the DXP will reverse the polarity of the line for a period of
at least 140 msec. It will hold this reversal until it is ready to receive
incoming digits. At that time, it will return the polarity to normal.
After the line polarity returns to normal, the CO will begin sending the
dialing digits. If the CO does not see the line polarity return to normal
within 4 to 8 seconds, it will route the call to network reorder. There is
no requirement for the CO to retry failures on lines with delay dial
signaling.
8 - 14 Line Programming