Product specifications

CRS-170A L-Band 1:1 Redundancy Switch Revision 3
Connector Pinouts MN/CRS170A.IOM
5.4 J4 Control Connector (Bottom) – Modem ‘B’, DB-9F
The Modem ‘B’ Control connector is a 9-pin Type ‘D’ female interface
located on the modem side of the CRS-170A L-Band 1:1 Redundancy Switch
module. Refer to Table 5-3 for pin assignments. Pins 2, 3, and 4 carry signals
looped through the switch module from Modem A to Modem B, while pins 6,
7, and 8 loop the same signals from Modem B through to Modem A. The
12VDC input, which is diode OR’ed with the corresponding 12VDC input
from Modem A, powers the switch module.
Table 5-3. J4 - Modem ‘B’ Control Connector Pin Assignments
Pin # Signal Function Signal Name Direction
1 Signal Ground Ground -
2 Modem A Tx Comm AUX_SER_TX_A Out
3 Modem A Clk Out CLK_OUT_A Out
4 Modem B Online ONLINE_B Out
5 Signal Ground Ground -
6 Modem B Tx Comm AUX_SER_TX_B In
7 Modem B Clk In CLK_IN_B In
8 Modem B Serial Faults SERIAL_FAULT_B In
9 +12 VDC +12VDC In
5.5 Antenna Side Type ‘N’ Connectors – J7 (Rx) and J8 (Tx)
The 50Ω female Type ‘N’ connectors on the antenna side of the CRS-
170A L-Band 1:1 Redundancy Switch module provide the coaxial
cable connections to the outdoor receive and transmit equipment (BUC
and LNB).
Table 5-4. J7 (Rx) and J8 (Tx) Type ‘N’ Connectors
Type ‘N’
Connector
Reference Description Direction
RX J7
RF Input In
LNB 10 MHz Ref Out
LNB Power Out
TX J8
RF Output Out
BUC 10 MHz Ref Out
BUC FSK In/Out
Comm. Out
5–3