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DCM-1 User Manual v1.0
Installation
22
Cable length and DC power considerations
The DCM‑1’s internal PSU has sufcient capacity to power 8
CDR‑1s (i.e., one per zone). If a system requires more than
8 in total, one or more additional PSUs will be required.
The maximum recommended cable length of the CDR-1
network is 1km. This gure applies either to the total cable
run between the “farthest” CDR-1 and the DCM-1 if a single
daisy-chain of CDR-1s has been employed (see Network
Diagram 3), or to the total run between the most remote
CDR-1s if the DCM-1 is in the “middle” of the chain (i.e.
multiple daisy-chains of CDR-1s, see Network Diagram 1).
Cable runs longer than this may work satisfactorily, but this
cannot be guaranteed. The probability of correct operation
is a function of cable length, the number of CDR-1s daisy-
chained, and how many of them are at a distance from the
DCM-1 close to the maximum cable length.
If any CDR-1s in a system are found to operate unreliably,
it may be necessary to power some independently, using a
local PSU. The Cloud CPM-PSU is suitable for this purpose,
and should be connected to the EXT POWER socket in
the rear of the CDR-1. Note that any further CDR-1s
connected to the POWER OUT connector will be powered
by the external PSU. (See page 21)
If a third-party external PSU is to be used, it should be rated
at either 12 - 24V DC or 9 - 17V AC. Each CDR-1 takes
50mA at 12V, so the current capability of any PSU should
also be checked. See page 53 for details of PSU and current
ratings.
Mic and Line input plates
Cloud ME-1, LE-1 and BE-1 remote input plates may be
connected to the DCM-1 in a similar manner to that
described for the CDR-1 remote controls, except that
screened CAT-5 cable should be used.
Remote plates may be “daisy-chained” for wiring
convenience, providing that the following guidelines are
observed:
ME-1 mic input plates cannot co-exist on the same
“daisy-chain” as LE-1 line input plates or BE-1 balanced
input plates.
LE-1 and BE-1 plates can co-exist on the same “daisy-
chain”.
If more than one plate is used for remote inputs
simultaneously, a mixed sum of all sources will be
presented to the DCM-1 input.
Note that the two mic inputs on the ME-1 remote plate
are summed together and passed to the DCM-1 as a mono
signal. The two inputs on the LE-1 and BE-1 are intended for
stereo use, and these plates’ connections to the DCM-1 are
in stereo.
The diagram below illustrates some of the connection
possibilities. Three ME-1, two LE-1 and one BE-1 plates are
shown. Microphone Inputs 1 & 3 and Extension Ports 3 & 4
are chosen for reasons of drawing clarity; any could be used
in practice.
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Mic/Line input plates