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MPM-1000A Operator Manual
CONN
Signal Name
J4
MODEM
CNTRL RX A1
J4
MODEM
CNTRL RX B1
J4
MODEM
CNTRL TX A1
J4
MODEM
CNTRL TX A1
J4
GND
J4
No Connect
J4
No Connect
J4
No Connect
J4
No Connect
* Note: These signals are used for depot level maintenance only; these signals not
active in a fielded modem.
14.3.2.17 Maintenance Interface
The Modem provides a Maintenance Interface. This interface provides access to the
serial debug ports of each of the processors internal to the Modem (Modem Control
Processor, Modem Processor 1 and Modem Processor 2). The Maintenance port
connector is protected by a tamper-evident seal that covers the access panel on the
chassis. Access to this port requires that the seal be broken. This interface is located on
the front panel J15 connector.
CONN
Signal Name
J15
GND
J15
MC DEBUG
RS-232 RX
J15
MC DEBUG
RS-232 TX
J15
GND
J15
GND
J15
MPM0
DEBUG
RS-232 RX
J15
MPM0
DEBUG
RS-232 TX
J15
MPM0
DEBUG
RS-232 RX
J15
MPM0
DEBUG
RS-232 TX
Table 14-15 RS-485 SCPC Control Interface
Input/Output
Input
Balanced RS-485
Input
Balanced RS-485
Output
Balanced RS-485
Output
Balanced RS-485
N/A
Ground
N/A
NOT USED
N/A
NOT USED
N/A
NOT USED
N/A
NOT USED
Table 14-16 Maintenance Interface
Input/Output
N/A
Ground
Input
RS-232
Output
RS-232
N/A
Ground
N/A
Ground
Input
RS-232
Output
RS-232
Input
RS-232
Output
RS-232
14-15
Signal Description
Signal Description
1000-7075 Rev E
Pin
1
2
3
4
5
6
7
8
9
Pin
1
2
3
4
5
6
7
8
9
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Troubleshooting
