System Reliability and Scalability

Support for standards-compliant reference interfaces — e2, e4 and Rq — enables service providers to easily integrate the Alcatel-Lucent 5750 SSC in a larger IMS context, with the following functions:

• e2 reference interface — Interface

to external service control functions

(SCFs), allowing the query of

subscriber and user-device state

information maintained by the

Alcatel-Lucent 5750 SSC NASS

function.

• e4 reference interface — Used internally

between the Alcatel-Lucent 5750

SSC NASS and resource

and admission control subsystem

(RACS); also enables interfacing with

The Alcatel-Lucent 5750 SSC soft- ware can be deployed on a wide range of single and multiprocessor server platforms to optimize scalability, and 1+1 or 1+n server/database redundancy provides protection against server or database failure (see Figure 3). The Alcatel-Lucent 5750 SSC scales with service providers’ needs as they add sub- scribers and services and expand the network footprint.

Figure 3. Alcatel-Lucent 5750 SSC Server and Database Redundancy

external RACS functions.

• Rq reference interface — Allows

interworking with external policy

decision functions (PDFs) in the IMS

service-control layer. For example,

Rq can be used to interface to a proxy

call session control function (P-

CSCF) to support bandwidth

management for IMS-based services.

• ETSI TISPAN-compliant support of the

NASS and A-RACF — Support for

NGN/IMS service delivery on Alcatel-

Lucent’s TPSDA.

• ETSI TISPAN Rq, e2 and e4 interface

support — To integrate with an IMS

CSCF, PDF, SCF or external RACS.

Central Locations

Primary

Database

5750 SSC Master

Controller Load

Balancing

Failover

5750 SSC

Slave

Controller

5750 SSC

Slave

Controller

5750 SSC

Slave

Controller

Secondary

Database

5750 SSC

Master

Controller

5750 SSC

Slave

Controller

5750 SSC

Slave

Controller

5750 SSC

Slave

Controller

Regional Locations

Alcatel-Lucent 5750 SSC manual System Reliability and Scalability

• e2 reference interface — Interface