LXD971L Intel, LXD971L Datasheet - Page 28

• Manufacturer Part Number: LXD971L
• Manufacturer: Intel

Specifications of LXD971L

• Lead Free Status / RoHS Status: Not Compliant

LXT38x LIU
Application Note
249464, Revision 2.0
10 August 2007
Question 6
Answer
Question 7
Answer
1+1 Protection without Relays Using Cortina Systems
How can HPS help my equipment’s reliability?
Not using redundancy can cause down time due to equipment failure. It could be hours for
a technician to get to the site and replace a failed board. Using 1+1 redundancy with
mechanical relays also causes down time. Due to the relay switching time, over 6,000 bit
errors will be produced. It only takes a few bit errors out of 1,344 consecutive bits to cause
a loss of frame sync forcing the system to reacquire frame sync. This means a potential
loss of almost 38,000 bits.
Using HPS will eliminate down time because the switch-over is accomplished in less than
1 μSec.
In the event of an electrical surge, won’t the back-up board get hit too?
Your first line of defense against electrical surges and lightning strikes is the front-end
protection circuitry (transient surge protection, fuses, etc.). Any residual transients that
make it past will not affect the back-up board due to the high impedance of the transmit
drivers and Schottky diodes.
®
LXT380/1/4/6/8 Hitless Protection Switching
4.0 Frequently Asked Questions
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