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User Interfaces DMD15/DMD15L IBS/IDR Satellite Modem
4-34 TM051 – Rev. 5.8
Under Interface menu:
Under Tx Setup menu:
Set INTF to RS-422
Set SCT Source to SCR
Set Tx Clock to SCTE
Method 2 -
Set mode to Closed Net
Under Interface menu:
Under Tx Setup menu:
Set INTF to RS-422
Set SCT Source to SCR
Set Tx Clock to SCTE
4.6 Configuring the DMD15/DMD15L for Drop and Insert
Several dependencies exist when configuring the modem for Drop and Insert (D&I). The following
paragraphs explain these dependencies and provide the user with the information required to
ensure smooth transition into D&I and to minimize the potential impact of these dependencies.
4.6.1 Data Rate
Data Rate affects the Drop and Insert function in the following ways:
It determines the number of Satellite Channels that will be displayed in the Edit Maps.
It contributes to the Operational Mode selection process. Trying to change the
Operational Mode to D&I when a data rate is not set to a valid D&I rate will result in the
error message ‘INVALID DATA RATE,’ and the mode change will not be allowed.
It contributes to the Terrestrial Framing Mode selection process. Trying to select a T1-
type Drop Mode such as T1-ESF with the mod data rate set to 1920000 bps (a valid E1
D&I rate but not a valid T1 rate) will result in the error message ‘INVALID DROP MODE’
and the selection will not be allowed. Trying to select a T1 type Insert Mode such as T1-
D4 with the demod data rate set to 1920000 bps will result in the error message INVALID
INSERT MODE and the selection will not be allowed.
Once D&I Mode has been selected, trying to change the data rate to something other
than another valid D&I data rate will result in the error message ‘RATE OUT OF
BOUNDS’ and the change will not be allowed.
Once D&I Mode has been selected with a T1 Terrestrial Framing Mode, attempting to
change the data rate to 1920000 will result in the error message ‘RATE OUT OF
BOUNDS’ and the change will not be allowed.
Therefore, the data rate should be entered as the first step in configuring the modem for D&I. The
Mod Data Rate should be set according to the number of timeslots to be dropped and the Demod
Data Rate should be set according to the number of timeslots to be inserted. The following table
gives the allowable D&I data rates based on the number of slots (n) to be dropped or inserted.
n = 1, data rate = 64000
n = 2, data rate = 128000
n = 3, data rate = 192000
n = 4, data rate = 256000
n = 5, data rate = 320000
n = 6, data rate = 384000
n = 8, data rate = 512000
n = 10, data rate = 640000
n = 12, data rate = 768000