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DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
The user can connect whichever systems on the earth stations that they desire to these Backward
Alarms Relays as long as they will supply ground to the Backward Alarm Relay Input in the "no
fault" condition and the ground will be removed in the "faulted" condition.
For example: the user could connect the Demod Summary Fault of the modem to the Backward
Alarm 1 Input, so that if the demod went into Major Alarm (such as a Carrier Loss), Backward
Alarm 1 would be transmitted to the receive end of the link. At the receive end, it would show up
as Rx Backward 1 (Receive Backward Alarm 1).
3.8.1 To Disable the ESC Backward Alarms
If the ESC ALARMS Port will not be used and the Backward Alarm Indications are to be disabled,
connect the following pins of the ESC ALARMS Port:
Connect Pins 1, 10, 11, 22 and 23 (connect all together). Pin 1 is ground and Pins 10, 11, 22, and
23 are the inputs of Backward Alarms 1 through 4. By connecting these four pins to ground
(Pin 1) the Backward Alarms will be disabled and indicate "PASS" for BK1 through BK4.
3.9 IDR or IBS/D&I Configuration Instructions
Note: Newer Modems are Front Panel Configurable (disregard Sections 3.9.1 and 3.9.2).
To check; from the Front Panel (Section 4.2.7), go to System Menu, Firmware Rev. Menu,
'DaughterCPLD', and check for F04230 Revision C or above, or F04821.
3.9.1 IDR Configuration (Older Modems)
1.
In this configuration, J17 on the back panel will be used as the ESC Port.
2.
Attach the 10 Pin Ribbon Cable from J17 on the Back Panel to J3 on the AS/3760
Interface Card.
3.
Remove Jumpers R38 and R40 located on the AS/3771 Daughter Card.
4.
Cycle power on the unit.
3.9.2 IBS/D&I Configuration (Older Modems)
1.
In this configuration, J17 on the back panel will be used as the ES-ES Communications
Port.
2.
Attach the 10 Pin Ribbon Cable from J17 on the Back Panel to J11 on the AS/3771
Daughter Card.
3.
Install Jumpers R38 and R40 located on the AS/3771 Daughter Card.
4.
Cycle power on the unit.
3.10 Configuring the DMD2401 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 Drop & Insert and to minimize the potential impact of these
dependencies.
TM065 - Rev. 3.3
Operation
3-7
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