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JunosE 11.3.x Physical Layer Configuration Guide
GE-8 I/O Module
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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.
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.
The GE-8 I/O module pairs with the GE-HDE line module to provide Gigabit Ethernet
operation through eight line interfaces.
NOTE: The GE-8 I/O module has a logical port, numbered port 8, that is
reserved for the hardware multicast packet replication feature. For more
information, see JunosE Multicast Routing Configuration Guide .
You can install the GE-HDE line module and its corresponding GE-8 I/O module in slot 1
or slot 2 of an ERX310 router or in any slot of an ERX1440 router.
The GE-8 I/O module can use either fiber-optic or copper SFPs. The I/O module accepts
up to eight 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 eight pairs of
copper SFPs.
Copyright © 2010, Juniper Networks, Inc.
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