4000 Digital Series II Issue 2.1 Technical Manual
STA0381 Page 69
4 Digital Routing Matrix
4.1 Racks
4.1.1 4420 4U rack
PDE4629 is the backplane sub-assembly as used in the 4420 4U rack frame.
It contains 7 pairs of 96 way DIN41612 connectors for rack cards and 2 off 15 way DIN41612
connectors for PD4172 power supply units.
Termination for the VME control bus and audio TDM bus is fitted at both ends.
Slot 1 is reserved for the PDE4642 processor card and PDE4643 rear connector unit ,but any other 4000
series II card can be fitted elsewhere.
In the case of processor redundancy , a second PDE4642 card is fitted in slot 2 and CON2 a pin header
array , should be fitted with jumpers.
CON19 is a 60 way SIMM connector reserved for the fitting of a PDE4641 dongle sub-assembly ,
necessary to uniquely identify the rack that the backplane is fitted to for the software on a PDE4642
processor card.
CON18 is a 3 way connector for powering the rack's fan unit.
CON17 is for PSU alarm indication.
2 LEDs are fitted , visible from the front of a rack , to indicate PSU status.
4.1.2 4920 9U rack
PDE4639 is the backplane sub-assembly as used in the 4920 9U rack frame.
It contains 20 pairs of 96 way DIN41612 connectors for rack cards and 4 off 15 way DIN41612
connectors for PD4173 power supply units.
Termination for the VME control bus and audio TDM bus is fitted at both ends.
Slots 1 & 2 are reserved for the PDE4642 processor cards and a PDE4643 rear connector unit ,but any
other 4000 series II card can be fitted elsewhere.
CON48 is a 60 way SIMM connector reserved for the fitting of a PDE4641 dongle sub-assembly ,
necessary to uniquely identify the rack that the backplane is fitted to for the software on a PDE4642
processor card.
CON49-52 are 3 way connectors for powering the rack's fan units.
CON45 is for PSU alarm indication and is brought out to the rear of a 4920 rack to a 9 way D-type.
4 LEDs are fitted , visible from the front of a rack , to indicate PSU status.
Rack coding , for multi- rack systems , is achieved with LK1-4.
Split output bus operation is achieved by fitting the termination networks RP45-48, removing jumpers
fitted at LK5 & 6 and fitting a jumper to LK7.
Refer to the 4000 Digital Series II Installation Guide for information on
the 4920 and 4420 matrixes.
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