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HSIM-W85 User’s Guide 1-5
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DS1 MIB Support
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LANVIEW LEDs
1.5.1 Connectivity
The HSIM-W85 module supports WAN technology using eight live full
duplex T1 connections.
The primary function of the HSIM-W85 is to provide LAN-to-WAN
access. WAN physical connectivity will be supported through the use of a
T1 interface. LAN-to-WAN connectivity will be supported through
HDLC and T1 Inverse Multiplexing (IMUX).
The HSIM-W85 interoperates with those Cabletron Systems WAN
products that support raw HDLC as the WAN protocol. This support is
limited to the CyberSWITCH product line which supports HDLC:
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CSX400 – Version 02.00.15 or higher
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HSIM-W6 – Version 02.00.15 or higher
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HSIM-W84 – Version 02.00.xx or higher
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HSIM-W87 – SSR 2200 Version 04.05.06 or higher
1.5.2 HDLC
The High-level Data Link Control (HDLC) protocol is used in
conjunction with the Inverse Multiplexing (IMUX) feature to conserve a
user’s WAN bandwidth between two Cabletron Systems products, over a
point-to-point connection. Cabletron Systems products such as the
HSIM-W6, HSIM-W84, HSIM-W85, HSIM-W87, and CSX400 must be
in use on both ends of the WAN link for these functions to work. The
HDLC (RAW) protocol reduces the amount of overhead information that
needs to be contained within each data packet to direct it to its destination.
This decreased packet overhead provides the IMUX functions with more
bandwidth to transfer user data.