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Intraplex Products
Section 2 – Theory of Operation
2.1 CrossConnect Concepts
2.1.1
Digital Cross-connect Systems (DCS)
Digital cross-connect systems (DCS) perform switching and routing functions on T1 time slots and
entire T1 circuits.
2.1.2
T1 Circuit Routing
Digital cross-connect systems can perform switching and routing operations on entire T1 circuits. In
these simple DCS applications, the T1 signal received on an input port is routed unchanged to a T1
output port. Examples of T1 circuit routing applications are
●
Loopback
●
Pass-through
2.1.3
Grooming
Grooming is the management of the time slots within the T1s on a wide area, public, or private
network to use long haul transmission facilities as effectively as possible. Grooming application
examples are
●
Point-to-multipoint
●
Interchange
Section 2.2 –
T1 Circuit Routing
gives more information on these applications.
Time slot cross-connection or grooming takes place by a process known as time slot interchange. Each
incoming T1 is captured and disassembled into time slots. Each disassembled time slot is then stored
in a CrossConnect matrix circuit on the DCS-6A. When the time slot is ready to be transmitted, it is
retrieved from the matrix circuit and re-transmitted. The DCS processor follows the instructions in a
time slot interchange map, determining which incoming time slots will be aligned with which outgoing
time slots.
Each DCS processor contains eight time slot interchange maps:
●
One default normal map
●
One alternate normal map
●
Six backup maps
These eight maps are configured by the user using the IntraGuide graphical user interface or using the
Intraplex Simple Command Language (ISiCL).
2.1.4
Protection Switching
In addition to grooming, you can use the DCS products to build fault-tolerant networks which detect
failures or degradation on T1 lines and automatically switch to backup facilities. There are two main
configurations for protection switching:
●
Point-to-point
●
Self-healing ring
Section 2.4 –
Protection Switching Applications
gives more information on these applications.
Summary of Contents for Intraplex T1 DCS-9530 CrossConnect System
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