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5.2 MC1 Switch Model

The MC1 interface board contains an MVIP enhanced compliant switch which allows connections to be made between the MVIP bus and the MC1 bus. The switch model for the MC1 board is shown in Figure 4. It contains the standard MVIP switching streams with 32 timeslots each. The MC1 board is considered a network module. This means forward streams drive the DSi pins on the MVIP bus and reverse streams drive the DSo pins on the MVIP bus.
Switching operations for the MC1 board are controlled using functions from the NMS SwitchPathTM library of C functions for MVIP switch control. Alternatively, you can use the NMS sw utility; a stand alone program which allows you to issue individual commands interactively, or multiple commands in a batch file. For more information about SwitchPath, see the SwitchPath Technical Reference Manual. For more information about the sw utility, see the SW Utility User's Manual.


Figure 4. MC1 interface board Logical Switching Model
The MC1 board has 22 streams, with 64 timeslots each, associated with the MC1 bus. All streams may be used to receive data (input ports); 256 simultaneous connections can be made from any of the MC1 input ports. Each MC1 board in the system can monitor all data on the MC1 bus. Four of these streams may be driven by a single MC1 interface board (output ports). Only one MC1 board at a time may drive an MC1 stream.
The MC1 output streams are referred to in Figure 4 as Logical Streams A, B, C, and D. These logical streams are configured with software to a subset of the 22 possible MC1 streams. Although there is flexibility in configuring the logical numbers of the driven streams, some constraints apply. Only one stream from each of the following groups can be chosen as outputs: Group A 16, 20, 24, 28, 32, 36 Group B 17, 21, 25, 29, 33, 37 Group C 18, 22, 26, 30, 34 Group D 19, 23, 27, 31, 35
As an example, the user may select to drive streams 16, 17, 18, 19 or 20, 33, 26, 35 with a single MC1 interface board. Streams 16, 20, 30, 31 could not be chosen since streams 16 and 20 are both from Group A.These logical streams are referred to by stream numbers 16 through 37 during switching operations not by A,B,C, or D as shown in Figure 4. The choice of streams can be dynamically changed.
The configuration of the driving streams may be done using the mc1mon utility provided in the development kit or using the MC1 command MC1_CONFIG.

Group A	16, 20, 24, 28, 32, 36
Group B	17, 21, 25, 29, 33, 37
Group C	18, 22, 26, 30, 34
Group D	19, 23, 27, 31, 35

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