Polycom SoundPoint IP 500 Manuale di istruzioni

Polycom®SoundPoint®IP Technical Bulletin 1/27/04

This information applies to:

•SoundPoint IP 500

•IEEE 802.3af Inline Power Cable (Part No. 2200-11077-001 Rev A)

•PowerDSine Power over LAN Midspan unit models:

PD-6024/AC-X

PD-6024/ACDC-X

PD-6024/DC-X

PD-6024/AC/M-X

PD-6024/ACDC/M-X

PD-6024/DC/M-X

•Red-Hawk/CDT BL8000-series

SYMPTOMS

When SoundPoint IP 500 is powered via the optional IEEE802.3af Inline Power Cable on certain

PowerDSine Midspan Power over LAN units (refer to PowerDSine model numbers above), the Midspan

units may overload and fail after 13 or more phones have been connected. This causes power to be

suspended to all phones connected to the Midspan unit.

CAUSE

Midspan Power over LAN units are typically installed in conjunction with standard terminal switches

(example: Cisco 2950). If these switches use ganged RJ-45 connectors, a ground loop may be formed

between shared terminations on the Midspan unit. This causes the Midspan unit to allocate current to

multiple phones on a single port which then causes the Midspan unit to go into fault mode and suspend

power to phones after reaching the maximum power dissipation of the unit. Problems have been reported

using 24-port Midspan units upon reaching a limit of 13 Inline Power Cable connections. Full list of terminal

switches using ganged RJ-45 connectors is incomplete at this time.

The released version of the IEEE Specification (now referred to “IEEE802.3af-2003”) now necessitates that

all Powered Devices (example: Polycom IEEE802.3af Inline Power Cable) should add circuitry to prevent

ground loops from forming.

Polycom cable 2200-11077-001 Rev A precedes this IEEE802.3af-2003 specification.

Midspan Power over LAN units with separate Power Supply for each port (example: RedHawk/CDT

BL8000 –series) do not exhibit this problem.

and trademarks are the sole property of their respective owners.

SOLUTION

Customers experiencing the issue above should use a revised cable. Similarly, customers who intend to

install networks using ganged RJ-45 connector terminal switches in conjunction with the PowerDSine

Midspan units should use this new revision IEEE802.3af Inline Power Cable with Polycom SoundPoint IP

500 models. Part number of this new revision cable is as follows:

2200-11077-002 Rev A

This cable interoperates with the following switch modules providing power over Ethernet:

PowerDsine 30012/3006

PowerDsine 6001

PowerDsine 64012

PowerDsine 6024

Extreme Summit 300-48 Helium Rev A

Nortel Baystack 460-24T

Red Hawk BL-8520

Red Hawk BL-6524

3Com NJ105

3Com NJ220

3Com NJ200 Old

3Com NJ200 New

3Com NJ100

3Com 4400

Cisco WS-X4248-RJ21V

Cisco WS-X4548-GB-RJ45V

Avaya P333T

HP Procurve 2650

STATUS

Customers should check with their local reseller or distributor for latest availability of the new revision of

Polycom IEEE802.3af Inline Power Cable.

Published: January 27th, 2004

Last Updated: January 27th, 2004

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