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S12700 Series Agile Switches Typical Configuration Examples

This document provides examples for configuring features in typical usage scenarios.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Power Supply Guide for Interoperation Between Huawei PoE Switches and IP Phones

Power Supply Guide for Interoperation Between Huawei PoE Switches and IP Phones

This section describes whether a PoE switch can supply power to IP phones connected to the switch. For details about how to configure IP phones, see Interoperation Between Huawei Switches and IP Phones.

Principles

A device that needs to be powered by a PoE switch is generally referred to as a powered device (PD). Therefore, an IP phone is also a PD. Huawei PoE switches conform to IEEE 802.3af and IEEE 802.3at, use uniform power sources, and can provide power to all standard PDs by default. To enable Huawei PoE switches to provide power to some nonstandard PDs, you need to perform some configurations on the switches, Table 3-20 describes common causes for failures to provide power to nonstandard PDs.
Table 3-20  Common causes for failures to provide power to nonstandard PDs

Cause

Configuration to Be Performed on a PoE Switch

The PD detection signature capacitance is larger than 0.15 uF.

Run the poe legacy enable command on the interfaces that connect the switch to PDs to enable PD compatibility check.

The current of PDs cannot exceed 10 mA for more than 75 ms within every 325 ms after the PDs are powered on.

Run the poe power-on delay delay-time command on the interfaces that connect the switch to PDs to set the power-on delay. By default, the power-on delay of interfaces is 0. That is, power-on is not delayed.

The current for a specific PD class is larger than 51 mA.

Run the poe force-power command on the interfaces that connect the switch to PDs to forcibly provide power to the PDs.

Summary of Power Supply for Different Types of IP Phones

IP phones described in Table 3-21 have been tested and will be updated based on the test results.
Table 3-21  Power supply for different types of IP phones connected to PoE switches (this table applies to switches running V200R009 or later)

IP Phone Model

Whether PDs Are Standard PDs

Whether PDs Can Be Powered

Power Supply Failure Cause and Solution

Cisco CP-7962G, Cisco CP-7965G, Cisco CP-7975G, Cisco CP-7942G, Cisco CP-9951G, Cisco CP-7941G, Cisco CP-7941G-GE, Cisco CP-3905, Cisco CP-7961G, Cisco CP-7961G-GE, Cisco CP-7971G, Cisco CP-7911G, Cisco CP-8961G, Cisco CP-7945G, Cisco CP-7821G, Cisco CP-9971, Cisco CP-7906G, Cisco CP-7937G, Cisco CP-8945, Cisco CP-6945, Cisco CP-8841, Cisco CP-6941, Cisco CP-8831, Cisco CP-7841, Cisco CP-8945, Cisco CP-6921, Cisco CP-8961, Cisco CP-8941, CiscoCP-7906, Cisco 3905, Cisco CP-6961, Cisco CP-7811, Cisco SPA502G, CiscoSPA504G, Cisco SPA508G, Cisco SPA512G, Cisco SPA524G, Cisco SPA525G, CiscoCP-7970, Cisco CP-7911, Cisco CP-3911, Cisco CP-3951, Cisco CP-7985, Cisco6961, Cisco SPA509G, Cisco SPA942G, Cisco SPA962G, Cisco CP-7861, Cisco CP-7931G, Cisco CP-8811, Cisco CP-8851, Cisco CP-8851, Avaya 1608-I, Avaya 9650, Avaya 9611G, Avaya 4621, Avaya 1616-I, Avaya9630G, Avaya 1692, Avaya 9620, Avaya 9621, Avaya 9608, Avaya 1608, Avaya9641, Avaya 1230, Avaya 1210, Avaya 9610, Avaya 1220, Avaya9640G, Avaya 9670G, Avaya 4610sw, Avaya E129, Avaya 1120E, Polycom330, Polycom CX3000, Polycom vvx500, Polycom 550, Polycom CX700, PolycomCX600, Polycom 650sip, Polycom 601sip, Polycom 320, Polycom 450, Polycom301SIP, Snom 820, Snom 821, Snom 300, Mitel 5340, Mitel 5212, Nortel1140E, H3C 3120, GXP 1450, GXP 1630, GXP 2160, Atcom A11, EsceneES290-PN, Escene WS290-PN, Fanvil F52HP, Yealink SIP T23P, YealinkSIP T22P, Yealink SIP T28P, HP 4120, Alcatel Lucent 4068, NORTEL1140E, Huawei eSpace 8950, Huawei eSpace 7950

Standard PDs

Yes

None

Cisco CP-7940G, Cisco CP-7912

Nonstandard PDs

No

Cause: The PD detection signature capacitance is larger than 0.15 uF.

Solution: Run the poe legacy enable command on the interfaces that connect the switch to PDs to enable PD compatibility check.

Cisco CP-7960G

Nonstandard PDs

No

Cause: The PD detection signature capacitance is larger than 0.15 uf, and the cable pairs 4/5 and 7/8 of the IP phone has backfeed voltage.

Solution: Use an isolation header to power on these PDs. For details about isolation headers, contact product maintenance personnel.

Huawei eSpace 7910

Nonstandard PDs

After the switch powers on the IP phone, the power supply of the switch port is interrupted when the IP phone has the local power supply installed. In this case, the switch continuously attempts to power on the IP phone but the power supply is interrupted.

Cause: After the switch powers on the IP phone and the IP phone has a local power supply installed, the output power of the IP phone is less than 400 mW. As a result, the power supply of the switch is interrupted because the maintain power of the IP phone is low.

Solution: Run the poe legacy enable command on the interfaces that connect the switch to PDs to enable PD compatibility check.

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Updated: 2019-05-16

Document ID: EDOC1000069466

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