User guide

Canopy T1 / E1 Application Note
Issue 1, June 2005
5
Using This T1/E1 Multiplexer Application Note
This document should be used with following Canopy™ User Guides*:
- Canopy 45Mbps Backhaul User Guide
- Canopy T1/E1 Multiplexer User Guide
- Canopy System User Guide
* Important: Visit the Canopy Support Web Site to download the latest Canopy software and
Canopy User Guides. http://www.canopywireless.com/support_home.php
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T1 / E1 Multiplexer Application Note
1.0 Abstract
Circuit emulation is a challenging application for any packet-based infrastructure, and
even more so in a Time Division Duplex (that is, half duplex) operational mode. Canopy
supports, with external adjunct “terminal multiplexers” (TMUXs), the circuit emulation
application. Understanding configuration issues and maintaining realistic expectations is
essential. This guide addresses the configuration issues, outlines the radio conditions
necessary for successful circuit emulation, and sets expectations appropriate to this
demanding task.
2.0 Circuit Emulation over Canopy
Canopy supports circuit emulation via external TMUX devices that are paired at either
end of a backhaul link. Apart from the obvious need to configure the TMUX and the
associated Canopy network elements correctly, the success of the circuit emulation
depends upon how radio conditions impact the circuit emulation application.
Potential applications for the T1/E1 Multiplexer include:
◦ Delivering T1/E1 replacement
◦ Implementation of wireless PBX networking
◦ Establishment of cellular backhaul applications
◦ Providing homeland security backup/emergency voice networks
Each TMUX device converts the constant bit rate circuit into a constant sequence of
packets in a flow. These identically sized packets are launched at a constant time
interval to be transported to the other TMUX across the Canopy “air link”.
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