Cabletron Systems DMS-100 manual Network interface unit, Voice processor unit and Adas

Appendix H: ASU background information 179

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

DMS-100 Family EIU User Guide TELECOM12