Cabletron Systems STS16-20R - Manual (Page 53)

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Switch Overview SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
Built-in Port Counters
The SmartStack STS16-20D/STS16-20R supports a wide range of port counters,
which enables you to obtain a detailed overview of the port traffic. The counters
give a comprehensive overview in the areas of:
•
MAC Layer Counters
•
MAC Layer Error Counters
•
Frame Forwarding Counters
Stackable Architecture
All SmartStack STS16-20x switches are stackable.
SmartStack STS16-20D/STS16-20R switches can be stacked using the included
SmartStack STS-LM Link Module, the optional SmartStack STS-5SU Stacker Unit
or the optional SmartStack STS-8SU Stacker Unit for connecting up to eight
switches in a stack.
The STS-LM Stacker Link Module is a built-in feature of the SmartStack STS16-
20D and SmartStack STS16-20R Switches, the other two stacker units are optional.
The following sections describe how to stack the STS16-20x switches.
Back-to-Back
Two STS16-20x units can be connected together by fitting each switch with the
SmartStack STS-LM Link Module and connecting the switches together using and
appropriate stacker link cable. This simple connection doubles the number of ports
available.
Internal Stacker
The STS-5SU Internal Stacker Unit can be inserted into the stacker port of a switch.
It allows up to five switches from the SmartStack STS16-20RM switch family to
be stacked together. One of the switches in the stack must contain the STS-5SU
Internal Stacker Unit. The other switches in the stack must be equipped with a STS-
LM Stacker Link Module and an appropriate stacker link cable. This can result in a
stack of as many as five STS16-20x switches. The STS-5SU Internal Stacker Unit
works as a common backplane switching fabric, which provides 1.4 Gbps of
aggregate bandwidth.
External Stacker
The SmartStack STS-8SU External Stacker Unit is an external stack unit that
allows up to eight STS16-20x switches to be stacked together. Each switch in the