Preventing Power Loss; Assembling And Connecting The Dc Power Cable To The Router; Materials Required - Cisco ASR-920-8S4Z-PD Hardware Installation Manual

Preventing Power Loss

• Each chassis power supply should have its own dedicated input power source. The source must comply
• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be sized
• The circuit breaker is considered the disconnect device and should be easily accessible.
• The system ground is the power supply and chassis ground.
• Do not connect the DC return wire to the system frame or to the system-grounding equipment.
• Use the grounding lug to attach a wrist strap for ESD protection during servicing.
Preventing Power Loss
Use the following guidelines to prevent power loss to the router:
• To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
Use the information in the
on a given configuration of the router. Determining power requirements is useful for planning the power
distribution system needed to support the router.

Assembling and Connecting the DC Power Cable to the Router

Materials Required

• Three-meter long over-molded power cable marked with positive, negative, and grounding.
Figure 20: Four-pin Power Connector
1 DC plug
2 Cable
Cisco ASR 920-10SZ-PD and Cisco ASR-920-8S4Z-PD Aggregation Services Router Hardware Installation Guide
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with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
according to the power supply input rating and local or national code requirements.
supplies is within the current ratings of the wiring and breakers.
that use ferroresonant technology. These UPS types can become unstable with systems such as the router,
which can have substantial current-draw fluctuations due to bursty data traffic patterns.
Table 1
5 Coupling nut
6 Contact socket
Installing the Cisco ASR 920-10SZ-PD and Cisco ASR-920-8S4Z-PD Routers
to estimate the power requirements and heat dissipation of a router based