Specifications

Base Site Controller
iDEN® System
August 08, 2000 68P81095E55-E 2-21
Facilities Interface Both iDEN system span line and the PSTN transport facilities (T1 and/or E1) are
connected to the MSC through Digital Trunk Controllers (DTCs). The DTC is the
interface between the MSC, the iDEN system, and the external world. T1 or E1
telephony connections may be hardwired to the DTC. The Signalling and data span
lines of the T1/E1s are split off and connected to the switch matrix for telephony data
and the LLP for signal processing. The DTC cards may be one of two types: T1 for
North American markets and E1 for International markets.
Specialty markets are also supported with other tailored DTC cards. The MSC
provides enough space for the connection of 60,000 simultaneous phone calls
(14,000 for the SNSE). The exact number will depend on the market and system
configuration as specified by planning and capacity. The DTC is the interface
between the external T1/E1 lines, the Core Processor and the Switch Matrix.
Switch Matrix The Switch Matrix a set of digital cross connections between input and output lines
that represents the path to be followed for a particular call setup. The design of the
matrix uses E1 style connections. Up to 60,000 lines may be attached to the switch
matrix (14,000 for the SNSE). Traffic flow and routing is controlled by the Core.
Core Processor The Core Processor is an Motorola 8800 series based CPU that interprets signaling
from the external PSTN and the iDEN network equipment to identify, authenticate,
service and route call signalling and traffic in the MSC.
Signaling Interface The Link Peripheral Processor (LLP) is the signaling interface of the MSC. All
interconnect signaling from the PSTN and the iDEN system passes through the LLP.
Home Location
Register
The Home Location Register (HLR) is a database system that is often implemented
as a stand-alone device or an outside service that is shared by one of more MSCs.
Visited Location
Register
The Visited Location Register is the location and activity database of the MSC.
Functional Characteristics
The MSC is the telephone switch for mobile originated or terminated traffic. Each
MSC provides service within a geographic coverage area, and a single iDEN
network may contain more than one MSC. Major functions of the MSC are:
• Control and Interface to the PSTN
• Call Processing for Interconnect calls
• Echo Cancellation for Voice Calls (with associated equipment)
• Provisioning of Subscriber Supplementary Services
• Authentication of Subscriber Units
• Intra-System Roaming and/or Handover between BSCs
• Inter-System Roaming and/or Handover between MSCs
• Billing Record Collection
• Interface to a customer supplied billing system
• Control of Inter-Working Function for data networking
• Interface to the Voice Mail System