Chapter 1: Product description
Ethernet bridging
Page 1-35
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Multiple registration protocol (MRP)
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Generic attribute registration protocol (GARP)
The management service in the PTP 670 Series does not generate or respond to any L2CP
traffic.
Quality of service for bridged Ethernet traffic
The PTP 670 Series supports a single traffic queue in the Second Data Service for Ethernet
frames waiting for transmission over the wireless link. The priority of the queue can be varied
with respect to the eight queues used for the data service.
Fragmentation
Ethernet frames in the PTP 670 Series Second Data Service are always fragmented for
transmission over the wireless link, even when the single queue for the Second Data Service
has higher priority than all of the data service queues.
Second Data port wireless link down alert
The PTP 670 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 Second Data Service. 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 Second Data Modulation Mode
The PTP 670 ODU can be configured to discard Ethernet frames in the Second Data Service
when the modulation mode is lower than the configured Lowest Second 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
Second 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 Second 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 670 customer data networks
How to configure the Ethernet Second Data
Service
