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Chapter 1: Introduction to the EIU 27
DMS-100 Family EIU User Guide TELECOM12
The Ethernet interface takes advantage of commercially supported peripherals
and functions. These interface devices are selected and qualified for
applications in the DMS-100 switch, with particular attention to hardware
compliance, maintainability, and the protocol set provided. The following
devices are commercially available:
• LAN repeaters to locally extend the range of the LAN
• LAN gateways to extend the range of the LAN to a metropolitan-area
network (MAN) or a wide-area network (WAN)
• asynchronous terminals and printers through communications servers at up
to 19.2 Kbit/s
• synchronous data links through communications servers at up to 56 Kbit/s
• IBM mainframe access through channel interconnect units
• workstations (for example, Sun, HP, IBM), Macintoshs, and PCs
• servers
The EIU is a simplex engine. A simplex engine is sufficient for the EIU
because the facilities that are connected through the EIU are not critical to the
operation of the switch (that is, for call processing). Sets of EIUs may be used
with one or more EIUs available as a warm standby spare. The mapping of the
EIU architecture to the OSI reference model is shown in figure 3 on page 28.
For more information on EIU sparing, refer to “EIU sparing and redundancy”
on page 41.