Specifications

X723-300151 A-1 Issue 2
A Patchfield Electrical
Diagrams
A.1 General Information
Patchfields for the system controller and Dual LIU Cards are pre-
programmed and held in PAL devices. The patchfield devices are
allocated a DT number which is marked on the device.
The following electrical equivalent diagrams refer to patchfields DT990/C
for the System Controller and DT995D for the Dual LIU Card.
Each patchfield can hold up to 8 patchfields, however only 1 to 7 should be
selected by the operator. Patchfield 8, not shown, in all cases is for test
purposes in manufacturing and must not be selected.
As an aid to determining a complete electrical picture for the Dual LIU
management routing when using different patchfields for line 1 and line 2,
it is suggested that separate copies be made of line 1 and line 2
patchfields, these can then be mated together to show for example line 1
patchfield 4 with line 2 patchfield 6.
If a line on a Dual LIU card is not used for carrying management, the
patchfield for that line should be patchfield number 1.