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Chapter 1:
Introduction
1-4 HSIM-W85 User’s Guide
The second mode of operation is using Cabletron Systems Inverse
Multiplexer (IMUX) functionality to aggregate multiple DS1 connections
into single higher bandwidth WAN connections. To operate in this mode,
the user configures the appropriate IMUX groups containing the DS1
connections.
Along with the built-in management features (Network Tools) described
in Chapter 4, the HSIM-W85 can be managed using SNMP. Statistical
data can be accessed via SNMP by referencing the interface group defined
in RFC 1213.
1.4 DATA FLOW IN THE HSIM-W85
The T1 data streams are terminated by T1 framers, which provide an
HDLC bit stream to the HDLC controller. The controller receives data
packets from each of the bit streams and places them in a memory
subsystem. The on board CPU examines the packet and notifies the host
of its arrival. Finally, a Cabletron proprietary ASIC transfers the data to
the host platform.
This process is followed in reverse when a packet is transmitted from the
host platform out the T1 ports. The host platform notifies the HSIM-W85
when a packet is coming and transfers the packet to the memory. The
HDLC format is applied to the data, then the data is framed to a T1
format, and passed to the framer. The T1 data is transmitted out through
the T1 interface.
1.5 FEATURES
The following are some of the highlights of the HSIM-W85 features:
•
Data Transfer Rates of 12 Mbps in full duplex, when running all eight
T1s carrying continuous data traffic of 64-byte packets or larger.
•
High-level Data Link Control (HDLC) protocol
•
T1 Inverse Multiplexing (IMUX)
•
WAN IP Priority Queuing functionality
•
DS1 Alarm Thresholds
•
SNMP support