1 8665 Smart Router Overview
While dimensioning different things at the central of
fi
ces and other telecommunications sites,
the information about the power consumption of the NE or the current drawn by the NE may be
needed. Cooling of the telecommunications site might be a good example for the former case and
dimensioning of the cables and circuit breakers for the latter. The maximum current for the NE can
be calculated by dividing the suitable evaluated maximum power consumption of the NE for the
purpose by the lowest speci
fi
ed battery voltage for the NE.
1.4
Synchronization
8665 Smart Router has a common timing generator. It is especially needed when synchronous
Ethernet interfaces are in use. The generator is located on every LU1, and the timing reference
signals are distributed to every unit in the NE via the backplane.
The Timing Module provides a Synchronous Equipment Clock (SEC) or Stratum 3 generator
complying with the relevant requirements. Typically, the NE is synchronized with a clock derived
from any of the following input signals:
• LU1 interfaces: 10GBASE-R and 1000BASE-X
• Station Clock Input signal (E1/DS1)
• Station Clock Input clock (E1 G.703 2048 kHz)
For details of the synchronization functionality please refer to
8600 Smart Routers
Synchronization Con
fi
guration Guide
.
The selected reference signal must be originated from an equipment having, at least, the SEC quality
clock, that is, the reference signal quality must be as de
fi
ned in [ETS 300 462-3] and [EN 300
462-5-1] or [GR-253-CORE]. This means, for instance, that a 2048 kHz signal which complies with
[G.703] jitter and wander requirements may not be used as a reference.
When 8665 Smart Router is equipped with one LU1, the NE has one station clock interface (SCI),
i.e. one input and one output port. With a redundant con
fi
guration both ports are duplicated and 1+1
protection is provided. The protecting port has a common parameter set with the protected port.
Both LU1 drive their own station clock output (SCO) port separately.
1.5
8665 Smart Router Redundancy
1.5.1
Control Redundancy
8665 Smart Router can provide protection via the control functionality (CU). When two equal LU1
are installed in slots 2 and 13, 1+1 protection is provided for the NE control functionality and
for synchronization, if present in the line unit. At the same time, the power feed functionality
utilizes a protection where the input with a higher voltage feeds the NE. A critical failure in the
active LU1, where the CU is running, will trigger an automatic switchover to a redundant LU1.
On the other hand, a failure in the NE power distribution will not cause a switchover because the
DC inputs are shared continuously.
8665 Smart Router LU1 does not have a dedicated MFE (Management Fast Ethernet) port, instead
any available Ethernet port can be used as management interface. If this port needs to be protected,
ELP should be used to protect it.
76.8670-40128B
8600 Smart Routers
© 2015 Coriant.
8665 Smart Router FP7.0 Reference Manual
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