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178Appendix H: ASU background information
OSI router or support host services. The current list of router and host services that use dedicated EIUs include:
•automated directory assistance service (ADAS)
•billing server
•cellular digital packet data (CDPD)
•programmable service node (PSN)
•automatic file transfer (AFT)
•remote management system (RMS)
•internet central buffer manager (ICM)
Additional applications supported by EIUs are updated in Provisioning Rules for LPP, SSLPP, and SNSE LIS, System Engineering Bulletin SEB
EIUs are supported on the following platforms:
•link peripheral processor (LPP)
•
•SuperNode SE link interface shelf (SNSE LIS)
Frame relay interface unit
DataSPAN is the Nortel frame relay service (FRS) offering. DataSPAN is a
•OSI connectionless networking
•IBM system network architecture (SNA)
•transmission control protocol/Internet Protocol (TCP/IP)
X.25/X.75 link interface unit
The DMS packet handler allows ISDN basic rate service access for both B- and
For CDPD applications, the XLIU along with the EIU and the network interface unit (NIU) provides functionality to transport datagrams between mobiles, and private and public data networks.