The Private Line Automatic Ringdown (PLAR) feature provides rapid connections for Mitel 5560 IPTs used by securities and commodities traders. When a trader goes off-hook on a PLAR trunk, the device at the other end automatically rings without the need for dialing.
PLAR trunks are T1 or E1 links that use modified (inverted bit) Channel Associated Signaling (CAS) over E&M trunks. To work properly, this feature must be configured in the same manner at both ends of the connection.
PLAR trunks are supported for T1/E1 links on the T1/E1 Combo MMC, T1/E1 Dual Framer MMC and the NSU.
Support for PLAR on E1 links is limited to systems with Release 8.0 or higher software.
To program Private Line Automatic Ringdown:
Class of Service
Options form
Set the Individual Trunk Access field to "Yes".
Set the ANI/DNIS/ISDN Number Delivery Trunk
field to "No".
(Optional) Enable "Privacy Released" to allow other sets
in the same key system group to enter a call in progress on the DTS line
by pressing the busy DTS key.
(Optional) Enable "Ringing Line Select" to automatically
answer a ringing DTS line when the handset is picked up.
(Optional) Set Disable
Conference Join Tone to "Yes" to disable the tone that users
hear when a conference call is established.
(Optional) Set Disable
Executive Busy Override Tone to "Yes" to
disable the tone that all parties in a call hear when a user initiates
Executive Busy Override.
Digital
Link Descriptors form
Enter "T1D4" or CEPT CAS (for E1 links) in the Integrated
Digital Access field.
Digital
E & M Trunk Circuit Descriptors form.
Select "Immediate Start" from the Incoming Start Type and
Outgoing Start Type fields.
Set "AB Signalling Bit Inversion" to Yes.
Select "Loop" from the Address Signalling field.
To ensure proper trunk release when the far end disconnects, either
set Ignore Far End Disconnect to "Yes" (recommended) or set
the Guard Timer to 6000 ms.
Digital
Trunks form
Assign a DTS Trunk Service number to the PLAR trunk.
Multiline
Set Programming
In the Multiline
Set Keys form program a DTS key as follows:
Line Type:
set to "Single Line"
or "Key System" depending on the number of DTS keys that the
trunk appears on.
Button Directory: enter the
four digit trunk number proceeded by 'T'.
Ring Type: set to "Ring"
if ringing notification is desired.
Single
Line Set Programming
Program the set as a hotline
and set the answer point to a system speed call number that dials the
hunt group number of the PLAR trunk.
To initiate a PLAR call:
Go off-hook and press the key programmed for direct trunk select of the PLAR trunk.
To initiate a PLAR call:
Lift the handset.