Product specifications

CRS-170A L-Band 1:1 Redundancy Switch Revision 3
Cables and Connections MN/CRS170A.IOM
4.2 Cabling to the CDM-625
Examples for connecting a pair of CDM-625 modems together with the CRS-170A are provided in this
section. To enable 1:1 operation, refer to Chapter 3. MODEM AND SWITCH CONFIGURATION
in this manual and the CDM-625 Advanced Satellite Modem Installation and Operation Manual.
4.2.1 CRS-170A Æ CDM-625 1:1 Redundancy Kit KT-0000044
The following table provides a reference as to how the items provided in Redundancy Kit
KT-0000044 are utilized with all possible CDM-625 data interface configurations:
Kit KT-0000044 CRS-170A Æ CDM-625 1:1 Redundancy – Interface Cabling Reference
Qty/Kit
(REF)
Part No. Description Used For
Ch. 3
Fig
1 PL/10129-1 CRS-170A Switch – Top Assembly 1:1 Redundancy 3-1
4 CA/6357-4 RoHS-Compliant Cable – IF (Tx/Rx), 50Ω Type ‘N’, 4’
Modem Æ Switch IF Interface
3-1
2 CA/WR9378-4
Control Cable – Universal, DB-9M Æ DB-9M, 4’
Modem Æ Switch Control 3-1
1 CA/RB10461-1 Cable – 1:1 Y-Splitter, (2X) DB-25M Æ DB-25F
RS-422/232 Interface
HSSI Interface
3-3
3-4
1 PL/0000307
CIC-60 – Interconnect Converter, HSSI (SCSI-2 Mini-D) 50-pin
Female Æ DB-25M
HSSI Interface 3-4
2 RF/SA32KC-IN/OUT Splitter/Combiner – 2-way w/Bracket, .25-300 MHz, 75Ω BNC ASI Interface 3-5
4 CA/BNC75OHM Cable – IF, BNC, 1’
ASI Interface
G.703 Unbalanced Interface
3-5
3-8
3 CA-0000071 Cable – 1:1 Y-Splitter, (2X) DB-9M Æ DB-9F
Quad E1 Interface
G.703 Balanced Interface
ESC Interface
3-6
3-7
3-10
2 CN/BNC-TEE-JPJ T-Adapter, 50Ω BNC G.703 Unbalanced Interface 3-8
1 CA-0000070 Cable – 1:1 Y-Splitter, (2X) HD-44M Æ HD-44F Overhead Interface 3-9
1 CA-0000135 Cable – Shielded, PMSI Multi-drop, DB-9M Æ DM-9M PMSI Interface 3-12
4.2.2 Basic Modem-to-Switch Connection
Figure 4-1 shows how to connect a pair of CDM-625 modems together with the CRS-170A
L-Band 1:1 Redundancy Switch module; the accompanying table lists the cable assemblies
provided in KT-0000044 for this initial setup.
EXAMPLE: The Tx IF from ‘ Modem A’ connects to the Tx IF port ‘Tx A’ on the CRS-170A;
similarly, the Tx IF from ‘Modem B’ connects to the Tx IF port ‘Tx B’ on the CRS-170A.
The same logic applies for the Rx IF connections. Failure to observe this requirement will
result in system malfunction.
IMPORTANT
When connecting the Control cable between the CRS-170A and the modems,
ensure that screw locks on the ‘D’ type connectors are securely fastened.
This will prevent the accidental unmating of the cable, particularly when a
standby unit is being removed or replaced.
Refer to Sect. 4.2.3 in this chapter for details of the CDM-625 data interface configurations.
4–2