What's the difference between transport route and transport layer

what's the difference between transport route and transport layer,Can somebody give me some explaination? thks in advance!

Hi,
Transport Layer in ABAP Workbench
    The Change and Transport System supports the distribution of development
    work on large projects across multiple SAP Systems.
    The packages in each development system are grouped into one transport
    layer.
    The transport layer determines whether objects are assigned to a local
    or transportable change request.
Use
    Each of your SAP development systems is assigned a transport layer as
    its standard transport layer. If you use Extended Transport Control, you
    can assign different standard transport layers to certain clients.
    You can define at the most one consolidation target for each SAP System
and transport layer.
When you create a package, it is assigned the standard transport layer
of the SAP System.
If you want to assign a different transport layer to a package, you
require the administration authorization for the Change and Transport
System.
The objects in a package automatically have the transport attributes
defined for the corresponding transport layer.
o   If a consolidation route originating in their SAP System is defined,
     then the objects are assigned to a transportable request, and
     transported into the consolidation target when it is released.
o   If a consolidation route is not defined, the objects are assigned to
     a local request, and are not transported.
Customizing settings are not assigned to a package. They have the
transport attributes of the standard transport layer of the system or
client.
It is best to assign a package a standard transport layer for which a
consolidation route originating in the development system is defined.
To display and maintain the transport layers and routes, use the
Transport Management System (transaction STMS).
Only the system adminstrator can make changes.
Caution:
     The tables TSYST, DEVL, TWSYS, TASYS are no longer productive as of
     Release 4.0A and cannot be maintained.
Regards
Ben

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