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CDM-600 Satellite Modem Revision 7
Clock Modes and Drop and Insert (D&I) MN/CDM600.IOM
10–9
10.7 Drop and Insert Clocking
The general arrangement for Drop and Insert clocking in the CDM-600 is shown below:
Figure 10-4 Drop and Insert Clocking
Note that are two inputs and two outputs shown for Drop and Insert Operation. These are:
• Drop Data In (DDI)
• Drop Data Out (DDO)
• Insert Data In (IDI)
• Insert Data Out (IDO)
This arrangement permits the user to choose between fully independent operation of the
incoming and outgoing E1/T1 signal, or to use the same T1/E1 signal for both Dropping
and Inserting (looped mode). If ‘Loop’ has been selected under the Drop and Insert
configuration menu, the Drop Data Out (DDO) signal is automatically looped internally,
to become the Insert Data In (IDI).
In this mode, timeslots are dropped from an incoming E1/T1 signal for transmission over
the satellite, and the same E1/T1 signal has time slots re-inserted into it that will over-
write data in existing timeslots.