Toshiba GR200 Series Instruction Manual page 517

Transmission control function (DIF_COMM)
In order that several protection functions can handle their computation diversely, the
transmission control (DIF_COMM) function is provided along with protection signalling
modules†. The DIF_COMM function operates with the telecommunication system; the
telecommunication medium is provided such as dark fiber (dedicated fiber-optic cable),
multiplexed fiber-optics, digital microwave, and others. Accordingly, the protection functions
linked with the remote-terminals can exchange their data mutually.
For the DIF_COMM operation, the user should arrange communication interface†,
synchronization method, and topology consideration: the communication interface provides the
link means physically; the synchronization method provides accuracy in their computation;
the topology provides the network configuration philosophy
†Note: For more information about the protection signaling modules, see Chapter
Technical description: Signal processing module: Communication modules
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Note: The implementation of such features is dependent upon the selection of hardware and
the configuration of functions. Several IED models do not support certain features. To
determine whether a particular feature has been implemented within an IED, identify the IED
ordering number; and check the order number at the "G&T position" referring to the
comparison table below. For more information, see
Table 2.36-1 Comparative table in respective ordering numbers
Main features
Number of terminals
Number of channels
✓: Applicable
Features
Communication for protection
Available maximum terminals
Maximum channel number per IED
NA: Not applicable
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Appendix: Ordering
.
Ordering No. at "G&T"
33
✓
3
2
GRL200 (Soft 033 & 037)
6F2S1914 (0.49)
. .
37
✓
3
2