Table 1-1. Crs-170A Application Summary; Figure 1-1. Crs-170A L-Band 1:1 Redundancy Switch - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 1:1 Redundancy Switch
Introduction
•
10 MHz frequency reference to LNB;
•
DC power supply to LNB.
The CRS‐170A monitors the faults of both modems and determines which modem should be
online. The data switch is built into each terrestrial data interface inside both modems
(excluding CDM‐600L [CLM‐9600L] and SLM‐300L3).
The CRS‐170A is designed to support 1:1 redundancy for Comtech EF Data CDM‐625, CDM‐840,
CDM‐750, CDM‐570L, CDM‐700, CDM‐710, CDM‐710G, CDM‐600L (CLM‐9600L), and SDM‐300L3
modems. Table 1‐1 summarizes the CRS‐170A 1:1 IF Switch applications, including requirements
for supporting data switching hardware and software.
Modem
CDM-625
CDM-840
CDM-750
CDM-570L
CDM-570L IP Module
CDM-700
CDM-710
CDM-710G
CDM-600L (CLM-9600L)
SDM-300L3
Notes:
1. For detailed information about the CRS-150 and SMS-301 switches, refer to their respective Installation and
Operation Manuals.
2. Order modems with Type 'N' connectors.
3. Firmware updates are free and may be downloaded from the Comtech EF Data web page. If a modem does
not meet the hardware requirements, contact CEFD – hardware revision upgrades must be performed at
CEFD
The off‐line modem holds its Rx terrestrial data in TRI‐STATE
CRS‐170A Switch. Because of this, it is very important to power down the off‐line
modem before disconnecting the modem from the Switch.
The CDM‐600L (CLM‐9600L) and SDM‐300L3 modems do not have built‐in switching capability for
the terrestrial data side of the link. For the CDM‐600L (CLM‐9600L), 1:1 redundancy requires both
a CRS‐150 switch to act as controller and terrestrial data switch and a CRS‐170A to perform the L‐
Band switching. The CRS‐170A is required because the CRS‐150 RF switching is limited to the

Table 1-1. CRS-170A Application Summary

1:1 Data Switch (See Note 1)
Built into the CDM-625
Built into the CDM-840
Built into the CDM-750
Built into the CDM-570L
User-provided hub or Layer 2 switch
Built into the CDM-700
Built into the CDM-710
Built into the CDM-710G
CRS-150
SMS-301
1–2
MN/CRS170A.IOM
Other Information (See Notes 2,3)
Firmware Ver. 1.1.1 or higher
Firmware Ver. 1.2.4 or higher
Firmware Ver. 1.1.1 or higher
Firmware Ver. 1.6.7 or higher
Firmware Ver. 1.5.4.2 or higher
Firmware Ver. 1.1.6 or higher;
Chassis Rev. A or higher
Firmware Ver. 2.4.1 or higher;
Chassis Rev. A or higher
Firmware Ver. 5.1.1 or higher
Firmware Ver. 1.1.4 or higher;
Hardware Rev. 3 or higher
Special version of SMS-301
®
as commanded by the
Revision 9