Dolby Laboratories DP524 - Manual (Page 30)

6-4
6.2.3 Back-to-Back Testing
For purposes of testing the Model DP523 and Model DP524 in a back-to-back
configuration, a special cable must be constructed. Note that a DTE-to-DTE
connection is not supported by the RS-449 specification. A standard 37-wire cable
cannot be used to interconnect the units. The special cable connects the TT outputs
of the DP523 directly to the ST inputsof the DP523 and to the RT inputs of the
DP524. This cable also connects the SD outputs of the DP523 to the RD inputs of
the DP524, and connects the signal grounds (SG) of the two units. The DP523 end
of the cable should be labeled “Encoder” and the DP524 end should be labeled
“Decoder”. The cable connections are shown below:
DP523 Encoder DP524 Decoder
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