Comtech EF Data CRS-500 - Manual (Page 61)

CRS-500 1:N Redundancy System Revision 2
Cables and Connections MN-CRS500
4–5
4.2 CRS-500 Control Connections
4.2.1 Basic CRS-500 (CSU
 DSU) Unit Connection
For 1:N redundancy configurations that do not require use of the optional CRS-282xx Tx / Rx IF
Switch Units (ISUs), use a CA-0000234 Control Cable (DB-25F to DB-25M, 8’) to connect the CSU
to the DSU. This is the basic setup for all redundancy applications. Otherwise, refer to the next
section to make the Unit-to-Unit cable connections between the CRS-500 CSU, DSU, and
optional CRS-282xx ISU(s).
4.2.2 Optional CRS-500 (CSU  DSU CRS-282xx ISU) Unit
Connections
Make sure the power supply is disconnected before you connect any cables.
Serious injury or death could occur if the power supply is connected while you
connect any cables.
When a Tx IF ISU is not present, the CRS-500 will mute the offline modem(s)’ Tx IF.
When the optional Comtech EF Data CRS-282xx Tx/Rx ISUs are required, configured in either a
single IF band (i.e., 70/140 MHz or L-Band as shown in Figure 4-1) or dual IF band (i.e., 70/140
MHz and L-Band as shown in Figure 4-2), make all cable connections as instructed in this chapter
section.
First, connect and secure the CA-0000234 Control Cable (DB-25F to DB-25M, 8’) between the
CRS-500 CSU and the DSU as follows:
• DB-25M connector labeled “P2 | Switch Control” on the CSU’s CRS-530 System
Controller, to
• DB-25F connector on the rear panel of the DSU labeled “J1 | CSU/DSU CONTROL”.
Next, to interconnect the optional Tx/Rx ISUs, connect and secure the CA-0000386 Multi-drop
Control Cable (DB-9F to [4X] DB-9F, 11’) between the CRS-500 DSU and up to four CRS-282xx
Tx/Rx ISUs as follows:
• DB-9M connector labeled “P1 IF SWITCH CONTROL” on the rear panel of the CRS-500
DSU, to
• DB-9M connector labeled “TO CRS SWITCH IF CONTROL” on the rear panel of each CRS-
500 Tx/Rx ISU.
If a single IF band configuration (i.e., [1] Tx ISU and [1] Rx ISU) is deployed, be sure
to tie off or otherwise secure any of the CA-0000386 Multi-drop Control Cable’s
unused DB-9F connectors.