Allied Telesis SwitchBlade x3100 Series Manual page 282

GE Interfaces
2.3 GE Interfaces
2.3.1 Overview
The two cards that provide the GE Interfaces (GE24POE and GE24SFP) have common attributes, as listed in
the following table. Also, note the following for each card type.
2.3.1.1 GE24POE Interfaces
The 1000BASE-T standard does not support running at 1 Gbps without auto negotiation, (SPEED=1000 and
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AUTO=OFF). The GE24POE allows this, but operation in this mode is not guaranteed.
The copper interfaces on the GE24POE card support automatic MDIX crossover detection. This keeps the
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user from having to use crossover cables for physical interface connections. Crossover detection works
whether AUTO is ON or OFF (does not depend on auto negotiation).
2.3.1.2 GE24SFP Interfaces
Three different Ethernet types are supported by the GE24SFP when the corresponding SFP module is inserted:
1000BASE-X
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100BASE-FX
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10/100/1000BASE-T (tri-speed copper).
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Some provisioned parameters and SFP module combinations are incompatible, such as SPEED=10 or
SPEED=1000 when a 100BASE-FX SFP is inserted, or SPEED=10 or SPEED=100 when a 1000BASE-X SFP is
inserted. SPEED will only be used for SFP modules recognized as models that support tri-speed operation with
an internal PHY. The actual operating value will be correctly displayed by SHOW INTERFACE which may
result in a mismatch between provisioning and actual SPEED.
The combination of SPEED=1000 and AUTO=OFF will not be blocked when an SFP module that supports tri-
speed operation is inserted. This is not technically a valid configuration per the 1000B-T standard and is differ-
ent than the operation of the GE24POE, but the combination is valid for 1000BASE-X SFP modules. This con-
figuration cannot be blocked during provisioning because it is not known in advance which SFP module will be
used. Instead, SPEED=1000 and AUTO=OFF is allowed, and is applied to the interface.
AUTONEGOTIATE does not apply to 100BASE-FX, and it is ignored when a 100FX SFP module is detected.
Port settings provisioned as AUTO are set to defaults as shown in table below. The actual operating value is
correctly displayed by SHOW INTERFACE.
2-2
Software Reference for SwitchBlade x3100 Series Switches (Interface Management)
Overview