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Rev. 1.2 

 

4–1 

Chapter 4. FUNCTIONAL 

DESCRIPTION 

 

 
The CRS-100 connects to two modems, an Online unit, and a Standby unit, monitors the 
fault status of these two units, and controls the routing of data and IF signals to and from 
the two units. In the case of an equipment failure, switching automatically takes place to 
protect the traffic circuit. At the heart of the CRS-100 is a Controller State Machine, 
which is responsible for fault monitoring and control of switching functions. It is 
implemented in a CPLD.  
 
The unit derives its operating power from the two modems - Online and Standby. A diode 
sharing arrangement, with a current sharing circuit ensures that in normal operation 
power is taken equally from the two modems. However, in the event that one of the two 
units is removed, the remaining modem can supply all of the current requirement. The 
Modems 12 volts DC (at a combined total of 160 mA max) and -12 volts DC (at 
a combined total of 100 mA max). Maximum power consumption occurs in either a V.35 
or  EIA-422 interface mode. Power consumption in  EIA-232 modes is approximately 
40% of the maximum values. The modem employ electronic fuses, which prevent 
excessive current from being drawn by the CRS-100, should an anomalous condition 
occur. 
 
Transmit, Clock, and Data signals entering the unit via the Data Interface are buffered 
and fed to both units simultaneously. This ensures that the Standby unit sees the same 
traffic conditions as the Online Unit. Receive Data and Clock signals coming from the 
Online Modem are routed, using signal relays, to the Data Interface. In the event that a 
switchover occurs, these relays switch so the Standby unit then supplies the Data and 
Clock signals. 
 
As only one Modem in the pair (the Online unit) is permitted to transmit its IF carrier 
signal at any one instant, the Standby unit is forced to disable its TX carrier, by asserting 
the TX Carrier Off signal at the Data Interface. In addition, the CRS-100 provides further 
isolation (and security) by using an RF relay within the unit. Unlike some other 1:1 
redundancy systems, which use a passive power combiner on the two Tx IF ports (and 

Содержание CRS-100

Страница 1: ...Part Number MN CRS100 IOM Revision 2 CRS 100 1 1 Redundancy Switch Operation Manual Accessory Product for use only with Comtech EFData CDM 500 550 550T Modems...

Страница 2: ......

Страница 3: ...for AUX Cable Date January 6 2006 Document CRS 100 1 1 Redundancy Switch Operation Manual Revision 2 dated November 1 2005 Part Number MN CRS100 EA2 Collating Instructions Attach this page to page 2...

Страница 4: ...Filename T_ERRATA 2 COMTECH PART NO PL WR9320 1 Figure 2 1 Cabling Details...

Страница 5: ...er to read Change Specifics The following cable assemblies are supplied with the CRS 100 as shown in Figure 2 1 Quantity 1 Comtech EF Data P N PL WR9320 1 Auxiliary Serial Cable Quantity 2 Comtech EF...

Страница 6: ...st 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 CRS 100 1 1 Redundancy Switch Operation Manual Accessory Product for use only with Comtech EF Data CDM 500 550 550T Modems Part Numb...

Страница 7: ...rt Department at service comtechefdata com Contact us via the web at www comtechefdata com 1 To return a Comtech EF Data product in warranty and out of warranty for repair or replacement 2 Request a R...

Страница 8: ...ing 2 1 2 3 Configuration 2 2 2 4 Connect External Cables 2 2 2 5 CRS 100 CIC 50 Cabling Details 2 5 CHAPTER 3 PHYSICAL DESCRIPTION 3 1 3 1 Front Panel 3 1 3 2 Rear Panel 3 1 3 3 Side Panel Right Side...

Страница 9: ...ERATION 6 1 6 1 AUTOMATIC OPERATION 6 1 6 1 1 INFO Information 6 1 6 1 2 INFO MISC Miscellaneous information 6 2 6 1 3 CONFIG MASK Alarm mask 6 3 6 2 Manual Operation 6 4 6 2 1 UTIL Utility 6 4 6 2 2...

Страница 10: ...ARNING indicates a potentially hazardous situation that if not avoided could result in death or serious injury Metric Conversion Metric conversion information is located on the inside back cover of th...

Страница 11: ...a single Comtech CDM 500 550 550T Modem or a pair of these Modems The User should observe the following instructions Equipment Connection The CRS 100 is designed for operation ONLY with Comtech CDM 5...

Страница 12: ...of measurement of radio interference characteristics of Information Technology Equipment FCC Part 15 Class B Immunity EN 50082 Part 1 Generic immunity standard Part 1 Domestic commercial and light in...

Страница 13: ...CRS 100 1 1 Redundancy Switch Revision 2 Preface MN CRS100 IOM viii...

Страница 14: ...EF Data No other warranty is expressed or implied Comtech EF Data specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies The remedies pr...

Страница 15: ...a pair of modems in a redundant configuration so that in the event of an equipment failure or an undesired traffic condition the unit will automatically switch data and IF signals from the failed unit...

Страница 16: ...tal security the Offline Modem mutes its TX carrier and the CRS 100 provides further isolation by using an RF relay within the unit Unlike some other 1 1 redundancy systems which use a passive power c...

Страница 17: ...nd that the unit functions correctly If damage is evident contact the carrier and Comtech EF Data immediately and submit a damage report Be sure to keep all shipping materials for the carrier s inspec...

Страница 18: ...to set which are located on the left hand side of the unit when viewed from the front These two switches control the conditions which initiate an automatic switchover Consult the following sections o...

Страница 19: ...CRS 100 1 1 Redundancy Switch Revision 2 Introduction MN CRS100 IOM 2 3 Figure 2 1 Cabling Details...

Страница 20: ...th the Factory WARNING It is extremely important to designate the two Modems as the A Unit and the B unit When two units are stacked together the top unit will be A and the bottom unit will be B It is...

Страница 21: ...0 IOM 2 5 2 5 CRS 100 CIC 50 Cabling Details Figure 2 2 shows how to connect the CIC 50 T1 E1 Interface Converter to the installation Quantity 1 Comtech EF Data P N CA WR9680 1 CIC 50 Adapter 25 pin M...

Страница 22: ...0 OHM CRS 100 CIC 50 CABLING DETAILS Receive IF User Data Interface Transmit IF COMTECH EFDATA PART CA BNC 75 OHM OR CA BNC 50 OHM COMTECH EFDATA PART CA BNC 75 OHM OR CA BNC 50 OHM 25 PIN D FEMALE 25...

Страница 23: ...n the front panel are two LEDs marked A Online and B Online Only one of these LEDs will illuminated at any given time and gives a visual indication of which of the two units is presently carrying traf...

Страница 24: ...n the side panel Figure 3 1 to the right are the two Tx IF ports A and B which are BNC female Connection is made to the pair of Modems using Comtech EF Data P N CA BNC 75 OHM 75 applications or Comtec...

Страница 25: ...ports A and B which are both BNC female Connection is made to the pair of Modems using Comtech EF Data P N CA BNC 75 OHM 75 applications or Comtech EF Data P N CA BNC 50 OHM 50 applications Additional...

Страница 26: ...CRS 100 1 1 Redundancy Switch 3 4 MN CRS100 IOM This page has been intentionally left blank...

Страница 27: ...power consumption occurs in either a V 35 or EIA 422 interface mode Power consumption in EIA 232 modes is approximately 40 of the maximum values The modem employ electronic fuses which prevent excess...

Страница 28: ...tatus is also reported over the remote control bus so an external M C system can determine the state of the redundancy system At the same time a GREEN LED will illuminate on the front of the CRS 100 t...

Страница 29: ...Clock B DTE to Modem TT B SCTE B 113 12 Internal Transmit Clock B Modem to DTE ST B SCT B 114 14 Transmit Data B DTE to Modem SD B SD B 103 15 Internal Transmit Clock A Modem to DTE ST A SCT A DB 114...

Страница 30: ...on of the CRS 100 the Modems must have the following Firmware versions installed CDM 500 Version 1 18 or later CDM 550 Version 1 10 or later CDM 550T Version 1 04 or later If the modems do not meet th...

Страница 31: ...w ready to put the system into operational use Before proceeding the User should check that the Auxiliary Serial link between the two units is functioning correctly From the front panel of the Online...

Страница 32: ...c faults the right switch in the Up or ON position 4 Unit faults or Rx or Tx faults both switches in the Up or ON position All of the possible fault conditions are listed below Unit faults Power suppl...

Страница 33: ...RX AIS BUF SLIP or TX AIS using the arrow keys then to press ENTER Following the selection of the alarm to be masked the User is then presented with a sub menu where the choice between ACTIVE and MAS...

Страница 34: ...to standby Observe that this only works from the front panel of the Online unit If this is carried out from the front panel of the Standby unit it will not cause a switchover The second method is via...

Страница 35: ...the Auxiliary Serial link between the two Modems Switch Conditions Switchover initiated following Unit faults only or Unit faults or Receive Traffic Faults or Unit faults or Transmit Traffic Faults or...

Страница 36: ...Weight 1 1 lbs 0 5 kg Dimensions 1 7H x 5 7W x 4 1D inches 4 3H x 14 3W x 10 4D cm Excluding connectors Power requirements 3 2 Watts maximum 12 volts DC 160 mA max 12 volts DC 100 mA max Power is supp...

Страница 37: ...103 1 609 x 103 1 609 1 mm 0 03937 1 kilometer 0 621 Temperature Conversions Units of Weight Unit Gram Ounce Avoirdupois Ounce Troy Pound Avoir Pound Troy Kilogram 1 gram 0 03527 0 03215 0 002205 0 0...

Страница 38: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...

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