EMC FC4400, Справочник по аппаратуре

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EMC Disk-Array Processor Enclosure (DPE) Deskside Model FC4400/4500 Hardware Reference
About the Deskside Disk-Array Processor Enclosure
Figure 1-7
LCC Ports and Indicators
LCCs support and control the Fibre Channel loops, and monitor the
enclosure environment. You can configure a deskside DPE with LCCs
in A slots or B slots to provide one Fibre Channel loop, or in both A
and B slots to provide two Fibre Channel loops.
An LCC in the DPE is connected to an SP via the midplane. An LCC
in the DAE is connected to the DPE using twin-axial copper cables via
standard DB-9 connectors. The cabling is not explicitly configured as
a loop (that is, a long return from the last DAE to the server), but
instead, as a set of full-duplex, point-to-point connections with the
last DAE in the chain closing the loop on its LCC.
The LCC without the primary connector independently receives and
electrically terminates the incoming FC-AL signal from the SP. The
LCC passes the input signal to its disk drives, and then drives the
output signal, via cables, to the next cabled DAE in the loop, if any.
Each LCC independently monitors the environmental status of the
enclosure using a microcomputer-controlled CRU monitor. The CRU
monitor communicates status to the SP using special protocols. These
protocols let the SP poll deskside DPE status and send commands
that control the LCC port bypass circuit and the disk-module Check
lights.
Each LCC has two status lights. These status lights are described in
the “Monitoring System Status” section of Chapter 3.
!
Check light
(amber)
EXP
Expansion FC-AL
cable connector
Active light
(green)
PRI
Primary FC-AL cable connector (DAE only)
Latch