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Support for standards-compliant reference
interfaces — e2, e4 and Rq — enables
service providers to easily integrate the
Alcatel-Lucent 5750 SSC in a lar ger IMS
context, with the following functions:
• e2 reference interface — Interface
to external service control functions
(SCFs), allowing the query of
sub scriber and user-device state
infor ma tion maintained by the
Alcatel-Lucent 5750 SSC NASS
function.
• e4 reference interface — Used inter nally
between the Alcatel-Lucent 5750
SSC NASS and resource
and admission control sub system
(RACS); also enables inter facing with
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 inter face to a proxy
call session control function (P-
CSCF) to support band width
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.
Alcatel-Lucent 5750 Subscriber Services Controller 14
5750 SSC
Slave
Controller
Regional Locations
Central Locations
Load
Balancing
Failover
5750 SSC
Slave
Controller
5750 SSC
Slave
Controller
5750 SSC
Slave
Controller
5750 SSC
Master
Controller
Primary
Database
5750 SSC
Slave
Controller
5750 SSC
Slave
Controller
5750 SSC
Master
Controller
Secondary
Database
Figure 3. Alcatel-Lucent 5750 SSC Server and Database Redundancy
System Reliability and Scalability
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 serv ices and expand the
network footprint.