Juniper G10 CMTS, Hardware Manual

Page: 58 / 210

NIC Module
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JUNOSg 3.0 G10 CMTS Hardware Guide 42
NIC Module
The NIC Module provides a GBIC-based network-side interface for the G10 CMTS, as well as
Ethernet switching functions. Four versions of this module are available:
!
Single mode, long range—Optical interface for long haul network connections, up to 80
kilometers.
!
Single mode, midrange—Optical interface for midrange network connections, up to 10
kilometers.
!
Multimode—Optical interface for short haul network connections, up to 550 meters.
This is the default configuration.
!
1000BT mode—Electrical interface for very short haul network connections, less than
100 meters.
The version of the NIC Module installed is determined by the GBIC (Gigabit Interface
Converter) modules you have installed. The GBIC module houses the network connectors and
associated interface circuitry. These modules are field-replaceable units.
The NIC Module also provides Fast Ethernet switch ports that can be used in conjunction with
the GBIC connectors. They are accessible on the NIC Access Module cable (see “NIC Access
Module” on page 48).
The NIC Module connects with the NIC Access Module in the rear of the chassis through the
midplane. This keeps the cabling in back of the chassis.
Figure 16 on page 43 shows the NIC Module front panel.
The NIC Module does not support the spanning tree
protocol (STP). BPDU packets are not forwarded by the NIC
Module.