nStor NexStor 4700F Series, Руководство пользователя

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Chapter 1 - Getting Started
SFF Transceiver
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SFF Transceiver
Host interface connectors on the RAID Controller are two SFF optical Small
Form-Factor integrated transceivers. They are high performance integrated duplex
data links for bi-directional communication over a multimode fibre. They are
designed to provide data rates up to 2.125 Gbps.
CAUTION: Do not look into the laser light beam for any extended period of time.
These optoelectronic transceiver modules are a class 1 laser product compliant
with FDA Radiation Performance Standards, 21 CFR Subchapter J. It uses a short
wavelength VCSELs (Vertical Cavity Surface-Emitting Laser).
Dust covers are provided to protect the transceivers’ optics. It is highly recommend
that the dust covers be installed when a connector is not in place.
Battery Backup Unit
The main board of the FC-SATA RAID Controller includes battery control circuitry
for a single cell Lithium Ion battery along with a battery pack mating connector.
The main purpose of battery backup is to maintain the cache memory during brief
power interruptions, but is capable of maintaining the memory content for several
hours, depending on the type and size of the memory.
The battery control circuitry has constant current using a constant voltage (CCCV)
charger. The battery charger provides a maximum 250mA charge current. When
the charge current falls below 16mA, the charger determines that the end of charge
has been reached, generates an end of charge indication and shuts itself off. If the
battery voltage drops below 3.0V, a complete battery discharge is indicated.
The battery control circuitry includes a battery safety circuit. The safety circuit
protects the battery by limiting the over-voltage to 4.3V, the maximum discharge
current to 3A for catastrophic events, and the minimum battery voltage to 2.35V. If
any of these conditions exist, the safety circuit disconnects the battery. These
conditions will only exist if there is a hardware fault present, and would never be
seen under normal operating conditions. In addition, the battery pack utilized
includes a resettable polyfuse that trips when the current exceeds 700mA at room
temperature. This protects the internal circuitry when, for example, a partial short
exists caused by a component failure.
4700F.book Page 12 Wednesday, April 6, 2005 11:05 AM