Quote:
Originally Posted by Kushan
I don't know how they could possibly achieve that without essentially laying the network down twice.
|
Your current phone line connects to a single point of failure line card via a single point of failure piece of copper, and from there goes on a fibre link whose resilience to JCB action may or may not be especially strong.
Resilience is supplied by using battery back up power supply for the amplifiers.
That is adequate, alongside ensuring that you've Pre-EQ and the UGS service flows that VoIP will use run at a very conservative modulation or aggressive dynamic upstream modulation profile if it's possible. Given each call requires just 64kbps running them at QPSK is fine.
QPSK with Pre-EQ, etc, etc, means upstream SNRs right down to ~12dB are feasible.