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61202129L1-1 TSU 120 User Manual
1-1
Chapter 1
Introduction
TSU 120 OVERVIEW
This manual covers the use of the following products:
• TSU 120
• TSU 120e
Unless otherwise stated, the TSU 120 refers to both products.
The TSU 120 is a T1/FT1 multiplexer with an Nx56/64 V.35
data port, a DSX-1 (PBX) interface, one option slot, and embed-
ded SNMP management. The TSU 120e offers a built-in dial
back up feature for the Nx port. The TSU 120’s option slot
accepts one of many available option modules for voice and
data applications.
The TSU 120
links user data sources such as local area network
(LAN) bridges and routers, computers, CAD systems, telecon-
ferencing equipment, and PBXs. Through the use of multiple
data ports, the TSU 120
can simultaneously connect one or
more of these devices to a T1 circuit. The amount of bandwidth
allocated to each port is custom-programmable. You can manu-
ally allocate bandwidth or set the bandwidth to automatically
change at predetermined times to use the available bandwidth
most advantageously. Changes in the configuration do not dis-
rupt data flow in channels that are not being reconfigured. The
unique architecture and the availability of option modules pro-
vides a path for growth to accommodate future requirements.