LXD971L Intel, LXD971L Datasheet
LXD971L
Specifications of LXD971L
Related parts for LXD971L
LXD971L Summary of contents
Page 1
Protection without Relays Using Cortina Systems Hitless Protection Switching Application Note 10 August 2007 Document Number 249464 Revision 2.0 ® LXT380/1/4/6/8 ...
Page 2
... Cortina in writing. Cortina reserves its rights to pursue both civil and criminal penalties for copying or disclosure of this material without authorization. INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH CORTINA SYSTEMS NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN CORTINA’S TERMS AND CONDITIONS OF SALE OF SUCH PRODUCTS, CORTINA ASSUMES ...
Page 3
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Contents 1.0 Introduction - 1+1 Hitless Protection Switching......................................................................... 5 2.0 1+1 Implementation ....................................................................................................................... 6 2.1 Architecture...........................................................................................................................6 2.1.1 LXT38x T1/E1/J1 LIU Family ................................................................................... 6 2.1.2 Design Considerations............................................................................................. 7 2.2 Receive Line ...
Page 4
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 20 HPS Test Set-up............................................................................................................................23 21 Diode Orientation...........................................................................................................................26 22 Block Diagram of Redundancy Circuit with Back-up Supply Voltage Removed............................27 Tables 1 Component List (LXT380/1 LIU) ...................................................................................................... 9 2 Component List (LXT384/6/8 ...
Page 5
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 1.0 Introduction - 1+1 Hitless Protection Switching Today’s telecommunications customers and international regulatory bodies demand an extremely high quality of service with little or no periods of service failure or ...
Page 6
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 2.0 1+1 Implementation 2.1 Architecture Figure 1 represents the typical architecture found in most T1/E1/J1 systems with redundancy protection. This approach is common in rack based systems where several boards ...
Page 7
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 • LXT384 LIU: Octal T1/E1/J1 LIU with digital jitter attenuation. Both hardware and software modes are available. • LXT386 LIU: Quad T1/E1/J1 LIU with digital jitter attenuation. Both hardware and ...
Page 8
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 • Avoid routing transmit and receive signals parallel to each other. This layout practice minimizes cross-talk. If you must cross these signals right angles. • Avoid routing ...
Page 9
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Table 1 Component List (LXT380/1 LIU) Component R7 TV1 T1 Table 2 Component List (LXT384/6/8 LIU) Component R7 TV1 T1 2.3 Transmit Line Interface Figure 3 LXT38x LIU Transmit Interface ...
Page 10
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 3 represents the recommended transmit line interface. The LIC contains the 1:2 transmit transformer and 560 pF pulse shaping capacitor. TV1 is included as a first level of surge ...
Page 11
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 3.0 Test Results The circuits in Figure 2 demo boards. The following performance parameters were tested for both coaxial and twisted pair cable where applicable: • Receiver sensitivity per ITU-T ...
Page 12
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 5 Coaxial Cable Output 3.1.3 Receive Return Loss Figure 6 and Figure 7 pair cable. The results are compared against G .703 minimum requirements. 1+1 Protection without Relays Using ...
Page 13
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 6 LXT380/1 LIU Rx Return Loss, Twisted Pair Cable Figure 7 LXT380/1 LIU Rx Return Loss, Coaxial Cable 1+1 Protection without Relays Using Cortina Systems 3.1 LXT380/1 LIU Test ...
Page 14
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 3.1.4 Transmit Return Loss Figure 8 and Figure 9 pair cable. The results are compared against ETSI ETS 300 166 requirements. Figure 8 LXT380/1 LIU Tx Return Loss, Twisted Pair ...
Page 15
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 9 LXT380/1 LIU Tx Return Loss, Coaxial Cable 3.2 LXT384/6/8 LIU Test Results 3.2.1 Receiver Sensitivity The devices were able to correctly recover data with cable attenuation up to ...
Page 16
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 10 E1 Twisted Pair Cable Output 1+1 Protection without Relays Using Cortina Systems 3.2 LXT384/6/8 LIU Test ® LXT380/1/4/6/8 Hitless Protection Switching Results Page 16 ...
Page 17
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 11 E1 Coaxial Cable Output 3.2.2.2 T1 Mode The configuration shown in lengths. Figure 12 and cable and maximum cable length. 1+1 Protection without Relays Using Cortina Systems Figure ...
Page 18
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 12 T1 Output with 0 ft. of Cable Figure 13 T1 Output with 655 ft. of Cable 1+1 Protection without Relays Using Cortina Systems 3.2 LXT384/6/8 LIU Test ® ...
Page 19
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 3.2.3 Receive Return Loss Figure 14 through Figure 16 Although there are no receive return loss requirements for T1, the results are compared against G.703 minimum requirements. Figure 14 LXT384 ...
Page 20
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 15 LXT384 LIU Rx Return Loss, E1 Coaxial Cable Figure 16 LXT384 LIU Rx Return Loss, T1 Twisted Pair Cable 1+1 Protection without Relays Using Cortina Systems 3.2 LXT384/6/8 ...
Page 21
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 3.2.4 Transmit Return Loss Figure 17 through Figure 19 Although there are no transmit return loss requirements for T1, the results are compared against ETSI ETS 300 166 minimum requirements. ...
Page 22
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 18 LXT384 LIU Tx Return Loss, E1 Coaxial Cable Figure 19 LXT384 LIU Tx Return Loss, T1 Twisted Pair Cable HPS Test Set-up 1+1 Protection without Relays Using Cortina ...
Page 23
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 3.2.5 Test Setup Figure 20 represents the setup used for hitless switching testing. A standard T1/E1/J1 pattern generator/analyzer transmits a framed pseudo-random pattern (215-1 for E1 and 220-1 for T1). ...
Page 24
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 • Jitter added to the input signal. The input T1 and E1 input signals were modulated with sinusoidal jitter. The tests were performed at the jitter frequency/amplitude points listed in ...
Page 25
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 4.0 Frequently Asked Questions Question 1 What is redundancy? Answer In the telecom industry, redundancy means having a back-up board in the system in the event the primary board fails. ...
Page 26
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 21 Diode Orientation Question 5 Can I power down the back-up board during normal operation? Answer This version of 1+1 Redundancy Protection without relays deals with leaving the backup ...
Page 27
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Figure 22 Block Diagram of Redundancy Circuit with Back-up Supply Voltage Removed Features Features for this solution include the following: • Highly integrated octal LIU with small footprint • Removing ...
Page 28
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Question 6 How can HPS help my equipment’s reliability? Answer Not using redundancy can cause down time due to equipment failure. It could be hours for a technician to get ...
Page 29
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 5.0 Conclusions The results presented in this Application Note demonstrate that the LXT38x LIU series save space and power and operate successfully with the backup board powered down in T1/E1 ...
Page 30
LXT38x LIU Application Note 249464, Revision 2.0 10 August 2007 Contact Information Cortina Systems, Inc. 840 W. California Ave Sunnyvale, CA 94086 408-481-2300 sales@cortina-systems.com apps@cortina-systems.com www.cortina-systems.com To provide comments on this document: documentation@cortina-systems.com 1+1 Protection without Relays Using Cortina Systems ...