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I would look at replacing the switch with a PoE switch. Power adapters are pretty expensive and it doesn't take a too many to make the PoE switch the more cost effective solution
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I would look at replacing the switch with a PoE switch. Power adapters are pretty expensive and it doesn't take a too many to make the PoE switch the more cost effective solution

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Good advice and good points. Thank you both. &nbsp;Studying Cisco 2960 PoE switches, I learned that the 370 watt powers 24 of the 48 ports. The 740 watt powers them all. &nbsp;It is a significant investment at $3k to $4k each, but probably worth it in the long run.
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Good advice and good points. Thank you both.  Studying Cisco 2960 PoE switches, I learned that the 370 watt powers 24 of the 48 ports. The 740 watt powers them all.  It is a significant investment at $3k to $4k each, but probably worth it in the long run.

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We're in the early stage of looking to replace our aging phone system with VoIP.<br />
<br />
Our 5 switches are Cisco 2960G ... Not PoE.<br />
<br />
Aside from no 9-1-1 in a power failure, is there any disadvantage to using power adapters on each VoIP desk phone vs. replacing two or more of our switches with expensive new ones ? &nbsp;We have maybe 75 phones. &nbsp;I also read that a Cisco PoE switch may have 48 ports, but only 24 of them can provide PoE power. Is this generally true or just for certain switches ?<br />
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Thanks.<br />
Stephen
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We're in the early stage of looking to replace our aging phone system with VoIP.

Our 5 switches are Cisco 2960G ... Not PoE.

Aside from no 9-1-1 in a power failure, is there any disadvantage to using power adapters on each VoIP desk phone vs. replacing two or more of our switches with expensive new ones ?  We have maybe 75 phones.  I also read that a Cisco PoE switch may have 48 ports, but only 24 of them can provide PoE power. Is this generally true or just for certain switches ?

Thanks.
Stephen

VoIP - PoE Switches vs. phone adapters

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

Voice Over IP

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.