Juniper G10 CMTS, Руководство по оборудованию

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NIC Module
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JUNOSg 3.0 G10 CMTS Hardware Guide 44
Functional Characteristics
The NIC Module contains a 6U (267 mm) x 340 mm card with a 4 HP (20 mm), single-wide
front panel. The module installs from the front of the chassis and is hot swappable.
The NIC Module provides the network-side interface of the G10 CMTS. It provides two Gigabit
Ethernet and 24 Fast Ethernet switch ports (eight ports are used for DOCSIS Module
connectivity, four ports are for general purposes, and 12 ports are reserved for future use).
The NIC Module aggregates all upstream traffic from the DOCSIS Modules and routes it to
one or more of the switch ports. The NIC Module distributes all downstream traffic from the
switch ports to the DOCSIS Modules. See “HFC Connector Module” on page 50 and
“Switched I/O Module” on page 53 for more information on traffic routing.
The NIC Module is powered by a 266 MHz MPC8240 processor and contains a 64 MB SDRAM
buffer, 32 MB of system memory, and a 32.5 MB flash memory, all delivering 6.6 million pps
switching capacity.
Physical and Electrical Characteristics
This section describes the physical dimensions, electrical characteristics and components of
the front panel. See Table 15 on page 44 through Table 21 on page 47
The NIC Modules install from the front and occupy midplane slots 5 and 9. To maximum the
number of MAC addresses supported, we recommend you use one NIC Module for each of
the two domains (A and B) of the chassis.
Each NIC Module consumes 36 watts maximum power.
Table 15: NIC Module Physical Dimensions
Table 16: NIC Module Connectors
Specification Value
Height 233 mm (9.2 in.) module
262 mm (10.3 in., 6 U) front panel
Width 20 mm (0.8 in.)
(front panel width)
Depth 340 mm (13.4 in.)
(excluding front panel and cPCI connectors)
Connector Label Function
0 and 1 Duplex Gigabit Ethernet interface converters with SC optical connectors, or HSSDC serial
connector for 1000BT mode.
COM RS-232 DB-9 connector for serial interface.