Pad Switching; 1.5 Mbit Dti/Pri - Nortel Meridian 1 Succession 1000 Manual

Page 120 of 236

Pad switching

1.5 Mbit DTI/PRI

553-3001-182 Standard 1.00
1.5/2.0 Mbit Gateway
in LD 73 for the 1.5 Mbit DTI/PRI. In addition, the 1.5 Mbit DTI/PRI pad
switching algorithm now requires the pads on analog trunks be switched in
when the connection involves a 1.5 Mbit DTI/PRI.
The default pad table (Table 1) in LD 73 meets current North American loss
and level requirements when the 1.5/2.0 Mbit Gateway (GPRI) package (167)
is equipped.
Supported hardware includes the following:
• QPC 720 (Version C or later) — 1.5 Mbit PRI card
• QPC 536 — 2.0 Mbit DTI card
• NT8D72 — 2.0 Mbit PRI card
• NT5D97 2.0 Mbit Dual Port DTI/PRI
• Meridian MS-1 Audio Teleconferencing bridge
1.5 Mbit DTI/PRI and 2.0 Mbit DTI/PRI all use dynamic pad switching
(DPS). 1.5 Mbit DTI/PRI and 2.0 Mbit DTI/PRI use the loss value input for
the port type in LD 73.
Descriptions of the pad switching algorithm and port type definitions for the
1.5 and 2.0 DTI/PRI from a Gateway point of view follow.
For the 1.5 Mbit DTI/PRI, switching of loss values occurs in the receive and
transmit directions. The applied losses depend on the port type involved in the
connection with the 1.5 Mbit DTI/PRI.
If the port type involved in the connection to the 1.5 Mbit DTI/PRI is an
analog trunk port, then the analog trunk sets its pad state to pad in and the
DTI/PRI applies the LD 73 defined loss values for that port type. If the port
type involved in the connection to the 1.5 Mbit DTI/PRI is digital trunk port,
then the originating side applies zero loss and the terminating side applies the
LD 73 defined loss values for that port type.
October 2003