Cambium Networks PTP 820 Series, User Manual, Page: 525 / 1149

Chapter 9: TDM Services and Interfaces Configuring Native TDM Trails
phn-3965_006v002
Page 9-17
o
1+1 Protection – Used for networks in which the PTP 820G 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
unit and the other end-point is located on third-party equipment supporting SNCP. The trail will have 1+1
trail protection in which two separate network paths are defined for the trail. Each trail has the same TDM
interface endpoints, but traffic flows to the destination via different radio 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, Radio Protection group,
Multi-Carrier ABC group, or cascading interface as the protecting interface.
o
1+1 Dual Homing Network Edge – Used for PTP 820G 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.
9 In the Local field, select 1 or 2. If you select 1, the Local field in the network element at the other side of the
link must be configured as 2, and vice versa.
o
If you selected Unprotected in the Trail Protection field, click Finish . The Selection Summary page opens
( Figure 301 ).
o
If you selected 1:1 Protection (revertive or non-revertive) or 1+1 Protection in the Trail Protection field,
click Next . The Protecting Interface Selection page opens.
Figure 299 Native TDM Service Creation – Protecting Interface Selection Page
o
If you selected 1+1 Dual Homing Network Edge in the Trail Protection field, click Next . The Working Trail
Selection page opens. Skip steps 10 and 11 and proceed to Step 12.
Figure 300 Native TDM Service Creation – Working Trail Selection Page