1 8665 Smart Router Overview
8665 Smart Router is a forced convection-cooled equipment. Fresh air is taken from the
bottom-front of the subrack and funn eled through the units and the outlet air is led to the top-b ack.
Forced cooling i s needed to dissipate the generated heat load and to maintain the components
within their operatin g limits.
Three fan modu les, located below the card shelf, b low air throug h the units. One module consists
of three parallel fans. If one o f the fans fails, the other eight w ill maintain adequate cooling for
a limited time.
The control functionality on LU1 monitors and controls the equipm ent temperature by adjusting
the fan rotation speed via the backplane. The rotation speed control of the fans is based on the
temperature values m easured from the com ponents on the units in the NE. The 8665 Smart Router
fan modu le supports 16-step fan speed control. At start-up the fans are runningatfullspeeduntilthe
equipment is booted up and able to monitor the card temperatures. The operatin g temperature of a
unit measured by any sensor is targeted to be below +67° C/+152.6° F. If any sensor exceeds that
value, the rotation speed of the fanswillbeadjustedtomaintainit.
There are several temperature measuring sensors on the line un it and sw itch unit. Some of them
measure the internal temperature o f the components, while o thers measure the line u nit temperatures
in different locations. Each sensor has its own threshold for high temp e rat ure warning a nd critical
temperature alarms. A high tem perature warning is raised w hen the measured sensor temperature
exceeds its time-conditional threshold for over 15 m inutes and immediately when the high
unconditional threshold is exceeded. The high temperature warning indicates that the o perating
ambient temperature is high and about to exceed the allowed operating range. If the warning occurs
and the equipment is not used in high ambient temperature, it may be advisable to change the air
filter and check that there are no obstacles preventing smooth air flo w. When operating at sea level
and the air filter is clean, this warning will occur at ambient near +45° C/+113° F.
If the data plane switch component temperature is exceeded the data forwarding for that SU1 is
disabled to cool down the unit, but the SU1 will s t ill switch the NE inter nal comm unication t o
protect the NE internal communication integrity.
LU1 will go to power-save mode, if the critical time-condition al threshold is exceeded for over 15
minutes or immediately, if the unconditional threshold is exceeded. LU1 will stay in power-save
mode for about 8-9 minutes before it ch ecks if the conditions are acceptable.
LU1 Temperature Warning and Alar
m Thresholds
Sensor Name
High Time-
Conditional
Threshold
High
Unconditional
Threshold
Critical Time-
Conditional
Threshold
Critical
Unconditional
Threshold
NPU
81° C (177.8° F) 90° C (194° F) 90° C (194° F) 100° C (212° F)
CPU
81° C (177.8° F) 90° C (194° F) 90° C (194° F) 100° C (212° F)
8665 Smart Router Fan
Modules and Their Operating Voltages
8665 Smart Router fan module Operating voltage is the 48 Vdc battery voltage, fed to fan modules
via the power input modules and the backplane.
8600 Smart Rout ers 76.8670-40128B
8665 Smart Router FP7.0 Reference Manual © 2015 Coriant.
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