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Operation and Control Instructions
PLEASE READ THIS SECTION VERY CAREFULLY IN ORDER TO UNDER-
Note:
STAND THE VARIOUS METHODS BY WHICH THE SKB PRODUCT MAY BE CON-
TROLLED.
In order to support the various implementation methods demanded by the OEM market, the SKB
Series Fiberoptic Switch Module offers various control and power interfaces. All interfaces men-
tionned in this document are present on all units.
As the SKB product can be used as a subsystem, it is expected that the customer system engineer
will make the decision concerning the appropriate type of implementation. Please contact JDS Uni-
phase Corp. if assistance is required in deciding which implementation method is best for your sys-
tem.
As a guide, the following information provides a very brief introduction to each interface, and a sam-
pling of applications favoring the interfaces identified.
The RS485 serial interface is located on the IDE 2x25 connector.
Examples of system level reasons for leveraging the RS485 serial interface are as follows:
•
Multiple SKB units are required on the bus (takes advantage of addressing feature).
•
The SKB unit is located a long way from the control and/or a noisy system (takes advantage
of noise immunity of differential signal).
•
The existing system bus is RS485 and/or in-house knowledge of the interface.
The parallel interfaces are also located on the IDE 2x25 connector. Two modes of implementation
(Simplex and Enhanced) are offered with the tradeoff being functionality versus complexity of imple-
mentation. The Simplex parallel interface is unidirectional where data is presented and strobed in,
and the Enhanced parallel interface is bi-directional, packet based.
Examples of system level reasons for leveraging the Simplex (SK/SP Emulation) parallel interface
are as follows:
•
The customer wishes to use this product to upgrade from the existing SK/SP product without
any software or hardware changes (in order to take advantage of environmental enhance-
ments).
•
When the enhanced features are deemed 'not required' for the product being developed.
Examples of system level reasons for leveraging the Enhanced parallel interface are as follows:
•
Reconfiguration or querying (status/health, identification, configuration) of the unit is deemed
a requirement.
•
Multiple SKB units are required on a parallel bus (can set up to 8 units in parallel using exter-
nal address decoding and the Bus Enable line of the SKB).
Situations may also arise where both parallel interfaces may be utilized by a
Note:
customer at different stages of the procurement, manufacturing, sales, and support
cycle. For instance, the implementation in the product may be in Simplex Mode but
Incoming inspection, Manufacturing, and field technicians may use the Enhanced
Mode (i.e. to take advantage of identification queries, configuration queries, status
queries, and reconfiguration commands).
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