VM600 MPS hardware manual (standard version) MAMPS-HW/E 2 - 3
Edition 17 - February 2018
Racks
OVERVIEW OF VM600 MPS HARDWARE
2.1.2 Slot number coding for cards in the rear of an ABE04x rack
Most cards installed in the rear of a standard 19" rack (ABE04x) use an electronic keying
mechanism to help ensure that the card is installed in the correct slot (for example, in the slot
directly behind the associated processing card in the front of the rack). This includes IOC4T,
IOC8T and IRC4 cards.
In ABE04x racks, each slot of the backplane has a unique, hard-wired 4-digit binary code
(see Figure 2-2) as follows:
Slot 3 Code 0011
Slot 4 Code 0100
Slot 5 Code 0101
Slot 6 Code 0110
Slot 7 Code 0111
Slot 8 Code 1000
Slot 9 Code 1001
Slot 10 Code 1010
Slot 11 Code 1011
Slot 12 Code 1100
Slot 13 Code 1101
Slot 14 Code 1110.
Cards that implement this electronic keying mechanism have a bank of micro-switches that
can be used to assign a slot number to the card (see Figure 2-2). This code is stored in the
slot number (address) assignation register on the card (IOC4T, IOC8T or IRC4).
Each card compares its slot number with the hard-wired slot number coded on the rack’s
backplane (see Figure 2-3). The result of the comparison is typically displayed on the SLOT
ERROR LED on the cards panel:
• If the codes are identical, the LED is green.
• If the codes are not identical, the LED is red.
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