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Extended distance support - Fibre Channel ports are configured
for extended distance operation (using repeaters) by changing the
port buffer-to-buffer credit (BB_Credit) setting to a higher value.
Refer to
Distance Extension Through BB_Credit
information. BB_Credits are configured as follows:
— Intrepid 6000-series Directors - Ports configured at 1.0625
Gbps transmit data (1,800 bytes frames) up to 120 km by
setting the BB_Credit value to 60. Ports configured at 2.1250
Gbps ports transmit data (1,800 bytes frames) up to 60 km by
setting the BB_Credit value to 60. Ports configured at 10.2000
Gbps ports transmit data (2,100 bytes frames) up to 100 km by
setting the BB_Credit value to 400.
— Intrepid 10000 Director - Each director LIM contains two
scalable packet processors, each supporting two optical
paddles (a maximum of 16 1.0625 or 2.1250 Gbps ports or four
10.2000 Gbps ports).
After assigning BB_Credit values of 16 to short-link ports and
setting the maximum BB_Credit to 1133 for a long-link port
(with the remote fabric PFE key enabled), a 1.0625 Gbps port
can transmit data up to 2,200 km, and a 2.1250 Gbps port can
transmit data up to 1,100 km. After assigning BB_Credit
values of 96 to short-link ports and setting the maximum
BB_Credit to 1085 for a long-link port (with the remote fabric
PFE key enabled), a 10.2000 Gbps port can transmit data up to
180 km. Refer to
configuration parameters and other detailed information.
— Sphereon 3232 Fabric Switch - All 2.1250 Gbps ports transmit
data (1,800 bytes frames) up to 60 km by setting the port
BB_Credit value to 60.
— Sphereon 4300 Fabric Switch - All switch ports are preset to a
BB_Credit value of 5. By enabling the full fabric PFE key, the
per-port BB_Credit value is increased to 12, providing a data
transmission distance of up to 24 km at 1.0625 Gbps and up to
12 km at 2.1250 Gbps. Refer to
— Sphereon 4500 Fabric Switch - The first four switch ports
(numbered 0 through 3) are preset to a BB_Credit value of 12,
providing a data transmission distance of up to 24 km at
1.0625 Gbps, and up to 12 km at 2.1250 Gbps. The remaining
ports are preset to a BB_Credit value of 5 and do not support
extended distance operation.
Introduction to McDATA Multi-Protocol Products
Introduction to McDATA Multi-Protocol Products
Distance Extension Through BB_Credit
Full Fabric
for detailed
for
for information.
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