Alcatel-Lucent 7210 SAS-D Configuration Manual page 189

7210 SAS-E platforms component redundancy is critical to reduce MTTR for the system and
primarily consists of the following features.
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For 7210 SAS-D devices:
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For 7210 SAS-K devices:
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7210 SAS D, E, K OS Basic System Configuration Guide
Redundant power supply — Supports use of 2 power supplies for redundant power
supplies. A power module can be removed without impact on traffic, when redundant
power supplies are in use. The power supply is hot swappable.
Fan module — Failure of one or more fans does not impact traffic. Failure of a single fan
is detected and notified. Fan tray/module is hot-swappable.
7210 SAS-D has an integrated AC or DC power supply. Redundant external backup
power supply is available only on 7210 SAS-D ETR variant. Use of redundant external
backup power supply is optional.
Fan module — 7210 SAS-D 128 MB devices support passive cooling. It has a fan to allow
air circulation (and not cooling). By default the fan mode is set to 'auto'. In "auto" mode,
by default, the software determines when to turn the fan 'on' and when to switch it 'off'.
This can be changed by the operator using the CLI command "configure> system> fan".
Operators have an option to switch off the fan permanently or turn it on permanently.
Hot swap — Power supply integrated into chassis. Hot swapping is not supported. The
external power supply backup connection can be added or removed anytime on 7210
SAS-D ETR.
The 7210 SAS-K (non-ETR) unit, supports a single external AC power supply.
7210 SAS-K ETR supports power redundancy and provides two power input pins on the
rear. The user has an option to use either AC, -48V DC, or +24V DC.
There are no fans in both 7210 SAS-K (non-ETR) and 7210 SAS-K (ETR) units, these
units are cooled passively.
System Management
Page 189