Cambium Networks PTP 820 Series User Manual page 544

Chapter 9: TDM Services and Interfaces
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1+1 Protection – Used for networks in which the PTP 820G or PTP 820F network elements are set up as a
chain connected to third party networks at two different sites, where one end-point is located on a PTP
820G or PTP 820F unit and the other end-point is located on third-party equipment supporting SNCP. The
service will have 1+1 path protection in which two separate network paths are defined for the service.
Each path has the same TDM interface endpoints, but traffic flows to the destination via different radio,
Ethernet, or cascading interfaces. Unlike 1:1 path protection, traffic flows through both paths
simultaneously, thereby supporting SNCP in third party equipment at the other end of the link.
When you click Next, you will be asked to configure an additional radio interface or group, or Ethernet or
cascading interface as the protecting interface.
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1+1 Dual Homing Network Edge – Used for PTP 820G or PTP 820F units located at the network edge in a
1+1 Protection configuration. Since the node itself is part of the protected or protecting path, the node
itself is essentially unprotected and you do not need to configure a separate protecting path.
When you click Next, you will be asked to configure a Working Path ID.
Note
In a 1+1 Protection configuration, the third-party equipment usually detects problems in the link via
E1/DS1 AIS signals. If the third party equipment does not support the ability to read E1/DS1 AIS
signals, it must be configured to perform switchover upon receiving an UNEQUIPPED indication in
the signal label bits in the overhead.
10 In the Local MEP field, select 1 or 2. If you select 1, the Local MEP field in the network element at the other
side of the link must be configured as 2, and vice versa.
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If you selected Unprotected in the Protection field, click Finish. The Selection Summary page opens
(Figure 315).
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If you selected 1:1 Protection (revertive or non-revertive) or 1+1 Protection in the Protection field, click
Next. The Protecting Interface Selection page opens.
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Configuring TDM Pseudowire Services