IBM 2109 Model M12, User Manual

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The 2109 Model M12 is a nonblocking core fabric switch. It never prevents a server
from being able to connect to storage, even under congestion. The backplane
bandwidth between ports on a 2109 Model M12 is sufficient to allow traffic to flow at
full bandwidth.
Throughput
The 2109 Model M12 provides continuous and sustained bandwidth to all ports in a
single or dual 32-port or 64-port switch scenario at their rated line speed.
Throughput is 2.125 Gbps inbound and outbound per port. All ports can be
simultaneously loaded for up to 100% utilization at full bandwidth. The backplane
can handle future support for a 128-port switch, 10 bps Fibre Channel, IP
connectivity, application processing and Infiniband.
Each port on the 2109 Model M12 is auto-sensing and supports 1 Gbps or 2 Gbps
speeds. You can manually set the ports to support either 1 Gbps or 2 Gbps links.
The ports perform speed-matching, which allows 1 Gbps and 2 Gbps links to mix
on any route within the fabric. When there is 1 Gbps in and 2 Gbps out, the ASIC
delays transmitting the outbound frame until half the frame is received at 1 Gbps.
With 2 Gbps in and 1 Gbps out, the ASIC delays releasing the buffer to ensure that
the 1 Gbps transmit port has adequate time to empty it.
Link distance
The 2109 Model M12 operates at up to 10 km (6.21 mi) at both 1 Gbps and
2 Gbps speed settings and supports LWL SFPs and single-mode fiber.
By using the Extended Fabrics optional software feature, the switch operates at
distances greater than 10 km (6.21 mi) by using various methods. The switch
leverages the current dense wavelength division multiplexing (DWDM) certification
and is certified to interoperate with equipment from Optical Networks, Cisco
Systems, Inc., Nortel Networks, and other leading vendors.
The switch operates at near full link speed at distances up to 100 km (62.13 mi) for
1 Gbps or 50 km (31.06 mi) for 2 Gbps speeds using the Extended Fabrics feature.
For information about Extended Fabrics, see the Brocade Distributed Fabric User’s
Guide.
SFP fiber optic transceivers
Each blade assembly supports up to 16 SFP fiber optic transceivers that convert
electrical signals to optical signals (and optical signals to electrical signals) and are
capable of transmitting at both 1 Gbps and 2 Gbps speeds.
Each SFP fiber optic transceiver supports 850 nm SWL, on multimode fiber optic
cable, or 1310 nm LWL, on single mode fiber optic cable. These miniature optical
transceivers meet the high port density that is available in the 2109 Model M12,
deliver twice the port density of standard removable gigabit interface converter
(GBIC) transceivers, and are encased in metal or shielded plastic to ensure low
emissions and high thermal management. SFP devices are hot-swappable and
connections are through industry-standard LC connectors.
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IBM TotalStorage SAN Switch: 2109 Model M12 User’s Guide