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Overview
HSIM-W85 User’s Guide 1-3
1.3 OVERVIEW
The HSIM-W85 extends the functionality of certain Cabletron Systems
platforms by providing an interface for Wide Area Network (WAN) DS1
services. The HSIM-W85 is a High Speed Interface Module (HSIM) used
to provide WAN services using the SmartSwitch series of products as a
platform. The HSIM-W85 has 8 physical DS1 interfaces, providing 8
separate logical DS1 connections. Eight separate T1 circuits can be
configured, or the circuits can be combined into various Inverse
Multiplexing (IMUX) groupings, up to a 12 Mbps full duplex data circuit
within a Layer 2 IMUX group.
The typical configuration is a head-end WAN aggregation point for up to
8 T1s into a single WAN physical interface. The HSIM-W85 is able to
uplink any combination of single T1s or multiple T1 IMUX groups to the
backbone. Refer to Appendix B for a diagram of a typical configuration.
The HSIM-W85 has its own i960 HD microprocessor used to process data
packets, provide simple configuration, Inverse Multiplexer functionality,
and statistics processing. The SmartSwitch host platform provides the
required logical IP Host services. The HSIM-W85 is designed to be
installed in any Cabletron Systems product that supports the High Speed
Interface Module.
The HSIM-W85 operates in two modes:
•
Switching
•
IMUX
The first mode, switching, is the default mode. The HSIM-W85 forwards
data packets received by the host platform out through the logical DS1
interfaces. It also forwards packets received in the DS1 interfaces to or
through the host. The default and only layer 2 WAN protocol used with
the HSIM-W85 is raw HDLC.
NOTE
The host platform may operate in 802.1D bridging, 802.1Q
VLAN, or SecureFast mode.