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Appendix H: ASU background information 179
DMS-100 Family EIU User Guide TELECOM12
Network interface unit
The NIU provides direct network connectivity for the link peripheral processor
(LPP), the single-shelf LPP (SSLPP), or the SuperNode SE link interface shelf
(SNSE LIS). The NIU gives some ASUs and services access to DS1 or PCM30
trunking without using channel banks or multiplexer equipment. Prior to the
availability of the NIU, physical connections were limited to DS0 or V.35
located on paddle boards of the LIU7 ASU. The NIU offers no service
functionality by itself and must be engineered with an LIU7, XLIU, or voice
processing unit (VPU).
For CDPD applications, the NIU provides management and maintenance
functions.
Voice processor unit and ADAS
ADAS is supported on the VPU, the application processing unit (APU), and
the EIU. ADAS provides voice processing capabilities for operator directory
assistance calls and allows for improved operator efficiencies and customer
service.
For ADAS, there are three types of ASUs that provide support for application
functionality and OAM functions:
• ADAS APUs support service-specific application software and off-load
the demands placed on the DMS-core. APUs can be configured for use by
any application with the appropriate software.
• ADAS VPUs support voice processing capabilities to store and playback
prompts, tones, and caller responses, as well as to detect dual-tone
multifrequency (DTMF) tones.
• ADAS EIUs support a link to an Ethernet local area network (LAN) for
communications with an ADAS OAM workstation.
ASUs and Cellular digital packet data
CDPD service transports datagrams between the mobile-end systems, and
private and public data networks.
There are three types of ASUs that provide support for CDPD service:
• CDPD EIU provides communication between the DMS-100 switch
supporting mobile-end systems and private and public data networks by
providing a link to the Ethernet. There are two types of functions supported
by EIUs for CDPD:
— IP-EIU routes IP traffic between mobiles and private and public data
networks
— CNLP EIU exchanges networking information (such as registering of
visiting mobiles) and forwarding of data with other mobile-end
systems