Time Slot Selection; Drop And Insert Clocking; Figure 10-4 Drop And Insert Clocking - Comtech EF Data CDM-600L Installation And Operation Manual

CDM-600L Satellite Modem
Clock Modes and Drop and Insert (D&I)
10.6

Time Slot Selection

Selection of the transmit and receive data rates may be made in certain 64 kbps
increments and may be independent of each other. The actual satellite rates are 16/15 of
the transmit or receive data rate to include IBS overhead per IESS
transparent to the user. For E1, the user can select any time slot (TS) from 1 to 31.
Selection of TS 0 is not permitted. For T1, the user can select any time slot (TS) from 1
to 24. The user may also select "N/A" to leave a satellite channel unused.
The configuration menu allows time slots to be selected for transmission or reception up
to the maximum dictated by the selected transmit or receive data rate, and may be
selected in arbitrary order. As an example, if the data rate is set to 256 kbps, the
maximum number of time slots that can be dropped or inserted is 4 (being 4 x 64 kbps).
Note that for 1920 kbps data rate the timeslots may not be manipulated. This is the 'fixed
channel' mode where Timeslot 1 is assigned to Channel 1, and so on.
10.7

Drop and Insert Clocking

The general arrangement for Drop and Insert clocking in the CDM-600L is shown
below:

Figure 10-4 Drop and Insert clocking

10–7
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