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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
Channel extender The IBM 9036 Remote Channel Extender (or equivalent device)
attaches an ESCON channel (TYPE=CNC) to a Symmetrix serial
channel interface. The Remote Channel Extender extends the distance
of the connection and, depending on the model, can convert
connections from multimode (3 km) to single-mode (20 km).
Note: Connections to Symmetrix serial channel interfaces must be
multimode.
Open systems Fibre
Channel interface
connections
The Symmetrix Fibre Channel adapter provides an interface between
the director and open systems host channels. Each Fibre Channel
adapter is located at the rear of the midplane, opposite its
corresponding channel director. These adapters provide the
connectivity between the host channels and the Fibre Channel
directors (FC-0 layer of the Fibre Channel standard).
The eight-port Fibre Channel director provides the capability for
eight concurrent operations through its eight physical interfaces for
communicating with the host systems.
Note: “Fibre Channel directors (front-end)” on page 77 contains more
information on the Fibre Channel director.
Fibre Channel directors use fiber optic cables. The channels use Fibre
Channel arbitrated loop or switched fabric links. Each link has two
physical fibers for transporting data: One for inbound signals and
one for outbound signals. The current Fibre Channel implementation
supports data transfer rates up to 4 Gb/s (Table 23 on page 98).
c
Table 23 Symmetrix Fibre Channel cable distances
a
Cable type Cable description Maximum distance
Single-mode
9 micron, 1 Gb/s 10 km (6.2 miles) per cable segment
9 micron, 2 Gb/s 10 km (6.2 miles) per cable segment
9 micron, 4 Gb/s 10 km (6.2 miles) per cable segment
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