Product information and planning
MPR-e 167
Synchronization
The MPR-e can be synchronized via either Optical or Electrical interface supporting one of
the following methods:
• SynchE (Synchronous Ethernet): the selection among Autonegotiation/SyncE IN/
SyncE OUT defines network clock direction (toward or from the radio) and applies
only when the electrical interface is used.
• PCR (Proprietary Clock Recovery): PCR is a copper synchronous Ethernet-based,
timing-over-packet technology. In standalone mode, the Source MAC address and
the Destination MAC address must be assigned. In Single NE mode with 7705 SAR,
PCR provides frequency synchronization between an MPR-e radio and an MWA port
on a 7705 SAR-8 or 7705 SAR-18 (a PMC is required).
• The MPR-e can also use its internal reference and discard any external
synchronization.
Synchronization: MPR-e standalone and 7705 SAR
In case of optical interface between MPR-e standalone and 7705 SAR, standard SynchE shall
be used. On the contrary, when copper interface is selected, synchronization must be
provisioned for PCR between the MPR-e and a microwave port on the 7705 SAR.
On the 7705 SAR side, PCR is always turned on automatically when a microwave link is
enabled on an MWA RJ-45 port or copper SFP is used.
Table 74: Default weights
Queue Weight
Q5 (higher priority) 16
Q4 8
Q3 4
Q2 2
Q1 1
Note: SSM is transparently forwarded in most of the configurations (see the Release Notice
for exceptions).
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