Should I use one or two PTP 820G chassis for G.8032 Ethernet ring protection?

The PTP 820G supports Ethernet ring topologies via G.8032.

Configure each node in the ring as follows:

  • a single PTP 820 platform with radios configured East/West
  • MP Ethernet service tying radio and Ethernet ports together

This is very simple and cost effective; a single PTP 820 node serves a single site.

For the record, PTP 820 hardware and software failures are unlikely—all PTP 820 units have very high MTBF—approximately multiple hundreds of thousands of hours.

However, failures can affect link and site availability, so you should analyze potential failures and their system performance impacts.

If an ODU (RFU-C) fails, one of the links goes down, but the site remains accessible.

Notice, however, that if the PTP 820G chassis fails, two links go down (instead of one), and the site becomes inaccessible!

The site is not accessible until the PTP 820G chassis is replaced.

This may be a reason to consider using two PTP 820G chassis at each site. Single ODU (RFU-C) failures or single chassis failures don’t cause the site to become inaccessible.

Configure each chassis at each node as follows:

  • Instead of both radios East/West, use one radio and one Ethernet port configured East/West
  • MP Ethernet service tying radio and Ethernet ports together
  • Connect chassis via Ethernet ports configured East or West in each chassis

Before you decide to use one or two chassis at each site, be sure you understand how failures affect your design’s system performance.

I hope this helps!

Dave

1 Like