Datum Systems M7 Series - Table 2-17 - M7 Overhead Channel - IBS Standard Mux - RS-232 (J25); Table 2-18 - M7 Overhead Channel - IBS Standard Mux - RS-485 (J25)

Maintenance M7/M7L/M7LT Modular Satellite Modem
2-18 M7/M7L/M7LT - Rev. 0.05
NOTE: The FIFO External Clock pins are an input to the modem. An input at the receive data rate
can be used to clock data out of the demodulator FIFO buffer. An input at the transmit data
rate can be used to provide a transmit send timing clock which the modem will phase locked
to (if within acceptable range). The send timing signal is still an output from the modem, but in
this case will be at the input signal rate. Both functions can be used simultaneously if the
transmit and receive data rates are the same.
Table 2-17 – M7 Overhead Channel - IBS Standard Mux - RS-232 (J25)
J10
Pin #
Signal Name
Use
Direction
1
Ground
All
Ground
2
ESC Send Data
RS-232 Standard Mode
Connection (synchronous)
Input
3
ESC Rcv Data
RS-232 Standard Mode
Connection (synchronous)
Output
5
ESC Send Clock
RS-232 Standard Mode
Connection (synchronous)
Output
7
Ground
Ground
Ground
8
ESC Rcv Clock
RS-232 Standard Mode
Connection (synchronous)
Output
9
Primary Interface
External Clock+ (B)
FIFO External Clock input ‘+’
or ‘B’ line. RS422 level
Input
15
Ground
Ground
Ground
17
Ground
Ground
Ground
21
Primary Interface
External Clock- (A)
FIFO External Clock input ‘-‘ or
‘A’ line. RS422 level
Input
Table 2-18 – M7 Overhead Channel - IBS Standard Mux - RS-485 (J25)
J10
Pin #
Signal Name
Use
Direction
1
Ground
All
Ground
2
ESC Send Data+ (B)
RS-485 Standard Mode
Connection (synchronous)
Input
3
ESC Rcv Data+ (B)
RS-485 Standard Mode
Connection (synchronous)
Output
4
ESC Send Data- (A)
RS-485 Standard Mode
Connection (synchronous)
Input
5
ESC Rcv Data- (A)
RS-485 Standard Mode
Connection (synchronous)
Output
6
ESC Rcv Clock- (A)
RS-485 Standard Mode
Connection (synchronous)
Output
7
Ground
Ground
Ground
8
ESC Rcv Clock+ (B)
RS-485 Standard Mode
Connection (synchronous)
Output
9
Primary Interface
External Clock+ (B)
FIFO External Clock input ‘+’
or ‘B’ line. RS422 level
Input
15
Ground
Ground
Ground
21
Primary Interface
External Clock- (A)
FIFO External Clock input ‘-‘ or
‘A’ line. RS422 level
Input