User's Guide Part 1

Table Of Contents
Chapter 1: Product description Ethernet bridging
Data port wireless link down alert
The PTP 700 Series provides an optional indication of failure of the wireless link by means of a
brief disconnection of the copper or optical data port allocated to the customer data network.
The Wireless link down alert can be used to trigger protection switching by Spanning Tree
Protocol (STP) or Ethernet Automatic Protection Switching (EAPS) and other higher layer
protocols in a redundant network.
Lowest Data Modulation Mode
The PTP 700 ODU can be configured to discard Ethernet frames in the Data Service when the
modulation mode is lower than the configured Lowest Data Modulation Mode.
This feature is likely to be useful in networks that have alternate routes, for example in a ring or
mesh topology where EAPS or RSTP is used to resolve loops. In this application, Lowest Data
Modulation Mode should be set to ensure that an active link will provide at least the minimum
necessary capacity for high-priority constant bit rate traffic such as voice over IP or TDM
pseudo wire. An active link will be blocked when the capacity falls below the minimum
required, triggering a routing change in associated Ethernet switches to bring alternate links
into use.
Lowest Data Modulation Mode should normally be set to BPSK 0.63 Single in simply connected
tree networks or other topologies that do not have alternative routes.
Further reading
For information about…
Refer to…
Factors to be considered when planning
PTP 700 customer data networks
Data network planning on page 3-35
How to configure the Ethernet service LAN Configuration page on page 6-34
How to configure Ethernet quality of service QoS Configuration page on page 6-44
How to monitor Ethernet performance System statistics on page 7-47
Second Data network
Transparent Ethernet service
The PTP 700 Series provides an optional second Ethernet data service between one of the
Ethernet ports at a local ODU and one of the Ethernet ports at an associated remote ODU. The
Ethernet service is based on conventional layer two transparent bridging. The PTP 700
maintains complete separation between Ethernet traffic in the data service and the second data
service.
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