Through NACD, the existing locally-dispersed directory assistance service system, which is dispersed into several areas, will be integrated into small numbers of core area centers so that it will be possible to secure efficient service management - and, specifically, for users to receive high-quality service in the automated phone number guiding service.

The NACD system complies confidence and stability shown in ITU-T, and is also designed to provide service of supreme quality. In addition, NACD uses programmable switching equipment of redundant-digital TDM structure. NACD can manage toll or international call routing, as well as additional services. Moreover, NACD inter-operates with the switching system of service providers.

ㆍProgrammable Switch
   Using standardized system and ONE (Open Network Expansion) architecture

ㆍOpen System Architecture
  Provides various applications and compatibility

ㆍScalability
  From 96 to 30,000 non-blocking ports

ㆍFull redundancy & hot swappable insertion/removal

ㆍSoftware reliability, automatic switchover
ㆍNetwork Interface
   E1/T1/J1

ㆍHigh Performance
   Up to 100,000 BHCC per node; Up to 1,200,000 BHCC per system

ㆍCommon Channel Signaling
   R2, E&M, DTMF, R1, ISDN, SS7, DASS2

ㆍSystem analysis / management

ㆍOn-line diagnostics - system and level

ㆍCall processing control

ㆍDSP resources (multi-function DSP)

ㆍBuilt-in function of IVR