Comtech EF Data DMD2401/DMD2401L - Manual (Page 31)

Operation DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
3-8 TM065 – Rev. 3.3
The following steps should be followed when setting up Drop & Insert:
1.
Select the appropriate interface type:
Newer Modem:
B.T1.AMI Balanced T1 (1.544 Mb) AMI Coding
B.T1.B8ZS Balanced, T1 (1.544 Mb), B8ZS Coding,
U.E1 Unbalanced, E1 (2.048 Mb), HDB3 Coding
B.E1 Balanced, E1 (2.048 Mb), HDB3 Coding
Older Modem:
B.T1.B8ZS
Balanced, T1 (1.544 Mb), B8ZS Coding,
U.E1 Unbalanced, E1 (2.048 Mb), HDB3 Coding
B.E1 Balanced, E1 (2.048 Mb), HDB3 Coding
2.
Set the mode to Closed Net
3.
Select the desired Data Rate.
4.
Set the Mode to Drop & Insert.
5.
Select the Terrestrial Framing.
6.
Select the Terrestrial Frame Source (applicable to Insert only).
7.
Use the SatCh TS edit capability to define the desired mapping of Satellite Channels to
Terrestrial Slots.
8.
Copy the appropriate Edit Map to the Active Map.
3.10.1 Interface Type
Interface Type affects the terrestrial framing and data rates used by the Drop & Insert function in
the following ways:
1.
When a T1 interface type is selected, the terrestrial framing options will only reflect the
valid T1 framing selections of:
T1-D4 (D4 framing, no Robbed Bit Signaling)
T1-ESF (ESF framing, no RBS)
T1-D4-S (D4 framing with Robbed Bit Signaling)
T1-ESF-S (ESF framing with RBS)
2.
When an E1 interface type is selected, the terrestrial framing options will only reflect the
valid E1 framing selections of:
PCM-30
(Channel Associated Signaling)
PCM-30C (CAS with CRC checking)
PCM-31 (Common Channel Signaling)
PCM-31C (CCS with CRC checking)
3.
When a T1 interface type is selected, attempting to change the data rate to 1920000 will
result in the error message ‘DATA RATE OUT OF BOUNDS’. If an E1 interface type is
selected, a data rate entry of 1920000 is valid and will be allowed.