Comtech EF Data SMS-301 - Manual (Page 71)

SMS-301 Redundancy Switch Theory of Operation
Rev. 3 4-5
4.3 Remote Switch (RS-301) Option
The application for this option is to provide access to tributary data, via the remote
switch, when the 1:1 switch is used with two SDM-300/-300A Satellite Modems that are
configured for the 8-Channel MUX option.
For this option an extender board (AS/6542) replaces the switch board that normally
resides within the 1:1 switch. This extender board interfaces with the M&C motherboard
and provides control signals, power and ground to an external data switch (RS-301).
The remote switch (RS-301) provides the user with connections for eight tributary
channels (EIA-422, EIA-232 data and clock) and one connection for auxiliary data. This
switch, under M&C control, will switch data (only) between the prime modem and/or the
backup modem, and the customer-data interface. The TX IF switching remains internal to
the 1:1 switch.
The M&C automatically detects this switch option and presents this information, via the
front panel display, under Interface Type in the Utility System menu.
The connectors for the remote switch are listed in Table 4-1.
Table 4-1. Remote Switch (RS-301) Connectors
Name REF DES Connector Type Function Table Reference
TRIBUTARY 1 DATA J1 15-pin D EIA-422 or EIA-232
TRIB 1 Clock and Data Table 4-2
TRIBUTARY 2 DATA J2 15-pin D EIA-422 or EIA-232
TRIB 2 Clock and Data Table 4-3
TRIBUTARY 3 DATA J3 15-pin D EIA-422 or EIA-232
TRIB 3 Clock and Data Table 4-4
TRIBUTARY 4 DATA J4 15-pin D EIA-422 or EIA-232
TRIB 4 Clock and Data Table 4-5
TRIBUTARY 5 DATA J5 15-pin D EIA-422 or EIA-232
TRIB 5 Clock and Data Table 4-6
TRIBUTARY 6 DATA J6 15-pin D EIA-422 or EIA-232
TRIB 6 Clock and Data Table 4-7
TRIBUTARY 7 DATA J7 15-pin D EIA-422 or EIA-232
TRIB 7 Clock and Data Table 4-8
TRIBUTARY 8 DATA J8 15-pin D EIA-422 or EIA-232
TRIB 8 Clock and Data Table 4-9
AUX J9 15-pin D Auxiliary Data Table 4-10
MODEM A DATA J14 100-pin Miniature D Modem A Data I/O Table 4-11
MODEM B DATA J15 100-pin Miniature D Modem B Data I/O Table 4-12
SWITCH CONTROL
INTERFACE J16 37-pin D Control Signals, Power and
Ground Table 4-13