9
The ES4704BD system board is an essential part of the switch, located inside the
switch and providing interconnectivity between the management switch modules (short for
management card
) and network interface modules (
line card
), and for all management
and control signals.
1.4.1.1.2 Power Supply
When using A.C. power supply, we shall adopt power supply of 90~264v and
corresponding A.C. distribution box. The permissible range of power supply is ±20%,
50Hz~60Hz. The maximum output power of single power supply module is 300W.
1.4.1.1.3 Ventilation and Cooling System
The operating ambient temperature of the ES4704BD is 0 ~ 40
°
C, the thermal design
of the equipment can ensure that the surface temperature of the device will not exceed the
50
°
C to 80
°
C, the highest temperature allowable.
The switch uses fan assemblies to disperse heat, with the air flow being drawn in
through the right section and out through the left section to facilitate air circulation, so that
the switch can maintain normal operation under specified environmental conditions. The
fan tray is attached to the fan tray slots left the board rack, and ventilation is provided via 4
axial fans that pump out air. Fan trays are hot swappable for maintenance, their status are
indicated by the FAN indicators on the main switch panel. In addition, dust gauze is
provided on the right of the board rack for filtering the air circulating through the rack. The
dust gauze can be unplugged and removed through the back for maintenance.
1.4.1.2 ES4710BD Chassis
The ES4710BD uses a 19-inch Rack Mountable Chassis, with the standard
dimensions of 436mm(W) x 797(H) x 478mm(D). The chassis consists of functional block,
thermal block, and power supply block. The function module block is a board rack, which
is the supporting structure for ES4710BD system boards (10 boards max). Ten wiring clips
are provided in the upper and lower parts of the board rack respectively, for the positioning
of all kinds of cables. In addition, there are two ESD Wrist Strap Connectors on the board
rack, located on the left side of the upper and lower rack respectively. The thermal block is
located on the upper part of the board rack, allowing three fan trays (2 axial fans for each
fan tray). Dust gauze is provided under the board rack for filtering air circulation through
the rack. The power block under the dust gauze provides power to the system, supporting
up to three power modules. The power modules insert into the power slots from the front,
with the distribution box at the back of the rack for maintenance. Closely beside the
distribution box, a grounding post has been provided on each side of the rack for
grounding connections. In addition, on both sides of the lower section of the chassis, a
handler is provided for easier transport.