Comtech EF Data SMS-7000 - Manual (Page 68)

Installation SMS-7000 Modem Protection Switch
2–34 Rev. 3
2.6.2.7 Unbalanced Data Ports
Unbalanced data ports on 75
Ω
BNC coax connectors contain G.703, D&I, and external
clock signals. These data ports also facilitate IBS, D&I, or IDR data. When selected from
the control panel, the Unbalanced External Clock replaces the external clock signals on
J1, J3, and J6. The pinouts are shown in Table 2-15.
C AU TIO N
When using the G.703 unbalanced data ports for other than IDR data, be
certain there is no connection to the J6 (EIA-422) or J1 (V.35) ports. When
using G.703 data, all data switch modules must have jumper JP1 in
EIA-422 position (with jumpers connecting the middle pin and the pin
closest to the front of the switch module).
Table 2-15. Unbalanced Data Connectors
Signal Name
Pin # IBS IDR D&I
CP1 G.703 SD G.703 SD DDI
CP2 G.703 RD G.703 RD IDO
CP3 Open Open DDO
CP4 Open Open IDI
CP5 EXC EXC EXC