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JUNOSe 11.1.x Physical Layer Configuration Guide
You can configure only port 0 for a Gigabit Ethernet interface; you cannot configure
redundant port 0R. Cabling both ports provides a redundant path to the Gigabit
Ethernet interface.
GE-2 SFP I/O Module
The ERX1440 router and the ERX310 routers both support the GE-2 SFP I/O module.
Other E Series routers do not support the GE-2 SFP I/O module. The GE-2 SFP I/O
module was previously called the 2XGE APS I/O module.
The GE-2 SFP I/O module pairs with the GE-2 line module and the GE-HDE line
module. You can install the GE-2 line module or the GE-HDE line module and its
corresponding GE-2 SFP I/O module in slot 1 or slot 2 of an ERX310 router or in any
slot of an ERX1440 router.
The GE-2 SFP I/O module can use either fiber-optic or copper SFPs. The I/O module
accepts up to two pairs (Tx/Rx) of LC-style fiber-optic connectors that support different
optical modes and cabling distances. Alternatively, the I/O module supports up to
two pairs of copper SFPs.
Ports on GE-2 SFP I/O Module
The GE-2 SFP I/O module has four ports: two ports (port 0 and port 1) are active (also
known as primary), and the other two ports (port 0R and port 1R) are redundant. If
an active port fails, its corresponding redundant port automatically becomes active.
You can configure only port 0 and port 1 for a Gigabit Ethernet interface; you cannot
configure redundant ports 0R and 1R. Cabling an active port and its corresponding
redundant port (that is, port 0 and port 0R, or port 1 and port 1R) provides a
redundant path to the Gigabit Ethernet interface.
Bandwidth and Line Rate Considerations
When the GE-2 line module or the GE-HDE line module is installed in the ERX1440
router, it delivers full bandwidth of 2 Gbps per port only when installed in slot 2 or
slot 4, and when the SRP-40G+ module is used in the router. When the module is
installed in any other ERX1440 slot, it delivers a maximum bandwidth of 2 Gbps per
line module (1 Gbps maximum at the ingress and 1 Gbps maximum at the egress).
Therefore, of the maximum 24 possible ports for the module in an ERX1440 chassis
(that is, two ports in each of 12 slots), full bandwidth is delivered only on a maximum
of four ports (those in slots 2 and 4).
When the GE-2 line module or the GE-HDE line module is installed in either the
ERX1440 router or the ERX310 router and both ports are active, line rate performance
is achieved only with packets that are 174 bytes or larger. The module might not
achieve line rate with packets that are smaller than 174 bytes.
GE-8 I/O Module
The ERX1440 and ERX310 routers both support the GE-8 I/O module. Other E Series
routers do not support the GE-8 I/O module.
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Gigabit Ethernet I/O Modules and IOAs
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