Card Cage and Midplane

Chassis

Table 2: Chassis Environmental Specifications

Specification	Value

Ambient temperature range (operational)	0° to +40°C (0° to +104°F)

Ambient temperature range (nonoperational)	–35° to +60°C (–31° to +140°F)

Altitude	60 m (197 ft.) below sea level to 1800 m (5,905 ft.)

Relative humidity	10% to 90% non-condensing

Vibration (operational)	5 Hz to 100 Hz and back to 5 Hz, at 0.1 g (0.1 oct/min)

The card cage is the main section of the chassis that houses all the modules, which are based on circuit cards. Card cage and midplane specifications are described in Table 3. The bays for the power supplies and power transition modules sit above the card cage, and the bays for the fans sit below it (see Figure 4 on page 11).

Table 3: Card Cage and Midplane Specifications

Specification	Value

Standard module dimensions	Module Face Plate
	262 mm (10.3 in., 6 U) height
	20 mm (0.8 in.) width, single-wide
	40 mm (1.6 in.) width, double-wide
	Module Circuit Card
	233 mm (9.2 in.) height
	340 mm (13.4 in.) depth - front modules
	80 mm (3.2 in.) depth - rear modules

Midplane dimensions	487 mm (19.2 in.) height
	428 mm (16.8 in.) width

Midplane card slots	13 slots spanning 21 connector columns

Module capacity	8 double-wide modules (16-slot equivalent)
(each front and rear)	4 single-wide modules
	4 single-wide modules
	1 unused single-wide slot

The midplane is the passive electrical interconnecting device for all modules in the chassis. It complies with CompactPCI Specification 2.0 R3.0, Oct.1, 1999. Analogous to a backplane, the midplane resides towards the middle of the chassis with connectors facing front and rear (see Figure 8 on page 15).

The G10 CMTS does not use all connector columns on the midplane. The DOCSIS Modules, HFC Connector Modules, and SIMs are an 8 horizontal pitch (HP), double-wide design covering two columns. The Chassis Control Modules and Hard Disk Modules are a 4 HP, single-wide design. Midplane slot 8 is not used. This is reflected in the slot numbering scheme.

The midplane extends the width of the chassis and the height of the chassis minus the top and bottom air chambers.

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Hardware Component Overview	21

Juniper Networks G10 CMTS manual Card Cage and Midplane, Chassis Environmental Specifications

Models: G10 CMTS

Chassis

Table 2: Chassis Environmental Specifications

Specification