Comtech EF Data SDM-650B - Manual (Page 96)

Configuration SDM-650B Satellite Modem
3–54 Rev. 5
3.6.1.3 Master/Slave X.21
Refer to Figure 3-18 for the X.21 master/slave configuration.
Figure 3-18. X.21 Master/Slave Configuration
Note: On Rev. E boards, there are on-board jumpers to loop back the clock. Refer to
Table 3-1 (see the note in the previous example).
3.6.1.3.1 Modem Settings (Master)
• TX-CLOCK: INT.
• Install JP10 and JP11 on buffer card (AS/3812).
• Set S3 as required. Refer to Table 3-9.
3.6.1.3.2 Modem Settings (Slave)
• TX-CLOCK: EXT.
• Install JP11 on buffer card (AS/3812).
• Set S3 as required. Refer to Table 3-9.