Japan D70 Nb+D - Nortel Meridian Meridian 1 Feature Description And Administration

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Operating parameters
Feature interactions
Feature packaging
553-2901-301 Standard 9.00 January 2002

Japan D70 nB+D

The nB+D enhancement adheres to current trunk assignment limitations on
the number of trunks that can be assigned to an individual trunk group.
For the ISDN layer 1 interface, the circuit pack QPC720 (Digital Trunk
Interface) is used for the Meridian 1 to D70 connectivity.
The QPC757E version of the D-channel Handler (DCH) circuit pack provides
the Layer 2 functions and incoming Layer 3 preprocessing for the Meridian 1
to D70 connectivity.
The NTAK09AA (DTI/PRI) circuit pack is used for Option 11C systems,
along with the NTAK93 D-channel Interface (DCHI) and NTAK20 Clock
Controller.
A Multi-purpose Serial Data Link (MSDL) can be used in place of the DCH
circuit pack (NT6D80AA).
PRI Channel Negotiation
When a D-channel has one or more secondary PRIs associated with it while
using the D70 interface, channel negotiation requires that the PRI interface be
explicitly defined for all B-channels not on the primary interface.
Japan D70 Connectivity
Interface Identifiers are required on all PRIs, including the primary PRI. This
interface is used in channel negotiation.
The following packages are required for Japan D70 nB+D:
• Digit Display (DDSP) package 19 for Calling Line Identification on
ISDN PRI;
• 1.5 Mb Digital Trunk Interface (PBXI) package 75;
• Integrated Services Digital Network (ISDN) package 145;
• Primary Rate Access (PRA) package 146;
• International Primary Rate Access (IPRA) package 202; and