VM600 MPS hardware manual (standard version) MAMPS-HW/E 3 - 9
Edition 17 - February 2018
VM600 6U 19" rack backplane (ABE04x)
GENERAL SYSTEM DESCRIPTION
3.4.2 Tacho Bus
The Tacho Bus has eight lines and is common to all slots in the rack. It is intended for the
transfer of speed signals between cards.
Speed signals can be put onto the Tacho Bus from an IOC4T card. This is done by
multiplexers that are under software control (see Figure 3-5). These multiplexers allow one
or both of the “local" speed signals on IOC #A to be sent to another card, for example to
IOC #B. Software-controlled demultiplexers on IOC #B allow the speed signal to be brought
off the bus and onto the card. Once on IOC #B, these signals can be used by the
corresponding MPC4 card (MPC #B). This technique is known as using “remote" speed
signals.
The VM600 MPSx software ensures that two or more speed signals are not sent to the same
Tacho Bus line. A signal on a given Tacho Bus line can be used by more than one card.
NOTE: Refer to the relevant manual for further information: VM600 MPS1 software
manual or VM600 MPS2 software manual.
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