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178 Appendix H: ASU background information
297-8991-910 Standard 03.01 August 1999
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 92-02-001.
EIUs are supported on the following platforms:
• link peripheral processor (LPP)
• single-shelf link peripheral processor (SSLPP)
• SuperNode SE link interface shelf (SNSE LIS)
Frame relay interface unit
DataSPAN is the Nortel frame relay service (FRS) offering. DataSPAN is a
high-performance connection-oriented packet switching data service.
DataSPAN is implemented using the frame relay interface unit (FRIU). The
data transfer services are applicable to a variety of data communications,
including the following:
• 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
D-channels to the X.25 packet network. It is implemented using the X.25/X.75
link interface unit (XLIU). The XLIU allows interconnectivity to other ISDN
nodes and public packet switched networks provided by operating companies
or inter-exchange carriers (IEC).
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.