Chapter 3: System planning
Data network planning
Page 3-36
Data network planning
This section describes factors to be considered when planning PTP 670 data networks.
Ethernet interfaces
The PTP 670 Ethernet ports conform to the specifications listed in
Table 65 PTP 670 Ethernet bridging specifications
Ethernet Bridging
Specification
Protocol
IEEE802.1; IEEE802.1p; IEEE802.3 compatible
QoS
PTP topology: Eight wireless interface priority queues based
on these standards: IEEE 802.1p, IEEE 802.1Q, IEEE 802.1ah,
IEEE 802.1ad, DSCP IPv4, DSCP IPv6, MPLS TC, DSCP in PPP
Session Stage
HCMP topology: Four wireless interface priority queues
based on these standards: IEEE 802.1p, IEEE 802.1Q,
IEEE 802.1ah, IEEE 802.1ad, DSCP IPv4, DSCP IPv6, MPLS TC,
DSCP in PPP Session Stage
Interfaces
100BASE-TX, 1000BASE-T, 1000BASE-SX, 1000BASE-LX
MDI/MDIX auto crossover supported
Max Ethernet frame size
PTP topology: 9600 bytes
HCMP topology: 2000 bytes
Service classes for traffic
PTP topology: Eight classes
HCMP topology: Four classes
Practical Ethernet rates depend on network configuration and higher layer protocols. Over the
air throughput is capped to the rate of the Ethernet interface at the receiving end of the link.
Layer two control protocols
PTP 670 identifies layer two control protocols (L2CPs) from the Ethernet destination address or
Ethertype of bridged frames. The QoS classification can be separately configured for these
protocols.
Table 66 Destination address in layer two control protocols
Destination address
Protocol
01-80-c2-00-00-00 to 01-80-c2-00-00-0f IEEE 802.1 bridge protocols
01-80-c2-00-00-20 to 01-80-c2-00-00-2f IEEE 802.1 Multiple Registration Protocol (MRP)