E1 Fallback Switch (4-Way)
Contents
1. ink for companies such as call centres that rely heavily on a mission critical PABX to provide the phones throughout the building in case the first fails Document Number 81037 Technically Speaking There are three sets of ports on the switch Port M which is connected to the terminal equipment Port A which is connected to Path A of the transmission equipment and Port B which is connected to Path B of the transmission equipment The Switching criteria between the ports A and B can be manual or automatic Operation and this is achieved in two ways Manual operation is achieved by using the selection switch on the front of the unit Automatic operation is based on internally generated alarms i e AIS or LOS Alarm Indication Signal or Loss of Signal and or a set of external inputs to select either Port A or B see diagram below Path A Alarms User s P z a 2Mbit s Transmission Unbalanced Switch Path A Port M Up to 4 Tributaries per port Transmission Select Path A Select Path B Path B Path B Alarms Path A Alarms Path B Alarms The switch is powered from either a 24 or 48 Volt nominal DC supply of either polarity Each port has four inputs and four outputs Each traffic interface is G 703 unbalanced 75Q Type 43 connectors The inputs at port M feed the A and B ports via a buffer The output at Port M is either from Port A or Port B depending on the position of the internal A B switch which in turn is driven by2. the external inputs i e the occurrence of an alarm event AIS LOS etc The Complete Package User Manual E1 Fallback Switch 4 Way 3 Way Power Connector 4 M6 Pan Head Bolts and Plastic Washers 4 Cage Nuts Document Number 81037 2 Specifications Alarms 8 Alarm inputs per port opto isolated 5V activation 1 Alarm output per port normally open relay Protocols Any HDB3 encoded G 703 data Connectors 24 Type 43 F 75 Q 2 DB25 F alarm input 1 DB9 F alarm output Indicators 3 LEDs A B Auto Power 24 to 48 VDC Size 4 5H x 48 3W x 30D cm Weight 5kg Operating Temperature 10 C to 50 C Relative Humidity 5 to 85 non condensing Product Name Order Code E1 Fallback Switch 4 Way 48 VDC a sce cee ves ces eas eee eee SWU2048 You may also need 75Q Type 43 to BNC pi Cables ne 1 8m 6 5ft E eee hie relator ean ds EVUT43 0006 3 0m 10 0t kaeka aee aee mar aae aar mae aae mas aas res rer rer rrr rrr ere EVUT43 0010 Document Number 81037 3
3. v vvv vy BLACK BOX E1 Fallback Switch 4 Way i a Back up your ee A mission critical E1 ey ease sees aaas 08 aS eS er links with this i ea n ui gy 1 robust 4 port ee el fallback switch Key Features Switches up to four G 703 unbalanced 2Mbit s circuits Solid state switching Weighted alarm inputs enables configuration of priority and switching criteria Hysteresis delay prevents switch chattering Compact 1U rack mount case DC power 24 to 48Vdc Manual or automatic switching Overview The E1 Fallback Switch is a universal solid state used to select between two banks of up to four 2Mbit s tributaries The switch is technology independent and can be used for route selection or to provide diversity between two different types of transmission links The unit is very compact utilising a single 19 rack mounting and the front access eases installation and maintenance The switch provides international standard G 703 traffic interfaces and can therefore be used with a wide range of equipment for a wide range of applications Each 2 Mbps channel on the switch has three ports attached to it connecting to the users terminal equipment and two transmission paths Switching occurs between the two transmission paths automically via weighted external inputs or through manual operation Opto isolated external alarm inputs can be used to activate the switch Typical Applications Provision of a backup E1 l
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