With a Cisco Unified IP Phone, you can help your business benefit from the productivity-building capabilities of next-generation communications and collaboration, which now includes Multimedia Video and Voice Communication. These industry-leading IP endpoints are designed to maximize network powered communications and collaboration.
Take full advantage of converged voice and data networks while retaining the convenience and user-friendliness you expect from a business phone. Cisco Unified IP Phones can help improve productivity by meeting the needs of users throughout your organization. Advanced media endpoints in this innovative suite of Cisco Unified IP Phones enhance the end-user experience.
Cisco IP Phone provides a comprehensive portfolio of wired and wireless IP handsets from basic lobby phones up to video enabled touch screen executive models. Models with the Cisco proprietary protocols are designed for deployment with a Cisco call processing server such as Callmanager or a Callmanager Express router. Phones with the SIP protocol can be configured to work with open source systems supporting the SIP protocol.
Have you used a Cisco IP Phone? Are you clear about Cisco IP Phones VOIP? Which one is the most popular Cisco IP Phone? What does Cisco Unified IP Phone bring to you? What benefit do you get from Cisco IP Phone? If these questions you can answer quickly? Congratulations, you en joy what Cisco IP Phones take for you…
To get know about some hot Cisco IP Phone types
- Come equipped with expanded memory to support graphics-intensive applications and value-added services.
- Power options, including a choice of PoE, Cisco Inline Power, or local power through an optional power adaptor.
- High-resolution colour displays, touch screen functions, and Gigabit Ethernet switch ports for fast communications access.
- Support for the Cisco Unified Video Advantage and VT Camera III application for video communications.
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- Large, backlit, vibrant high-resolution fully-adjustable color display enhances user experience with easy viewing.
- Delivers rich multimedia communications and advanced features in a design that is both user- and eco-friendly.
- The phones support the optional Cisco Unified Video Advantage and VT Camera III application for video communications.
- High-definition voice (HD voice) provides superior audio performance with HD voice headset, handset, and speaker support.
Cisco Unified IP Phone 9900 Series
- Portfolio of advanced collaborative media endpoints.
- Ideal for knowledge professionals, administrative staff, managers and executive offices.
- Includes Bluetooth, USB integration, higher-resolution colour displays, high-def voice (HD voice) and interactive business video support on all models with touch screen access and Wi-Fi integration on selected models.
- Interactive, high-performance business video accelerates decision making.
To select the appropriate switch for a layer in a particular network, you need to have specifications that detail the target traffic flows, user communities, data servers, and data storage servers. Company needs a network that can meet evolving requirements.
Traffic flow analysis is the process of measuring the bandwidth usage on a network and analysing the data for the purpose of performance tuning, capacity planning, and making hardware improvement decisions.
Network switches come in different sizes, features and functions, choosing a switch to match a particular network sometimes constitute a daunting task.
Consider what will happen if the HR or HQ department grows by five employees or more’ A solid network plan includes the rate of personnel growth over the past five years to be able to anticipate the future growth. With that in mind, you would want to purchase a switch that can accommodate more than 24 ports, such as stackable or modular switches that can scale.
When selecting a switch for the* access, **distribution, or ***core layer, consider the ability of the switch to support the port density, forwarding rates, and bandwidth aggregation requirements of your network.
Access layer switches facilitate the connection of end node devices to the network e.g. PC, Modems, IP phone, Printers etc. For this reason, they need to support features such as port security, VLANs, Fast Ethernet/Gigabit Ethernet, PoE(power over Internet, and link aggregation. Port security allows the switch to decide how many or what type of devices are permitted to connect to the switch. This is where most Cisco comes in, they all support port layer security. Most renowned network administrator knows this is the first line of defence.
Distribution Layer switches plays a very important role on the network. They collect the data from all the access layer switches and forward it to the core layer switches. Traffic that is generated at Layer 2 on a switched network needs to be managed, or segmented into VLANs, Distribution layer switches provides the inter-VLAN routing functions so that one VLAN can communicate with another on the network.
Distribution layer switches provides advanced security policies that can be applied to network traffic using Access Control Lists (ACL). This type of security allows the switch to prevent certain types of traffic and permit others. ACLs also allow you to control, which network devices can communicate on the network.
Core layer switches: These types of switches at the core layer of a topology, which is the high-speed backbone of the network and requires switches that can handle very high forwarding rates. The switch that operates in this area also needs to support link aggregation (10GbE connections which is currently the fastest available Ethernet connectivity.) to ensure adequate bandwidth coming into the core from the distribution layer switches.
Also, core layer switches support additional hardware redundancy features like redundant power supplies that can be swapped while the switch continues to operate. Because of the high workload carried by core layer switches, they tend to operate hotter than access or distribution layer switches, so they should have more sophisticated cooling options. Many true, core layer-capable switches have the ability to swap cooling fans without having to turn the switch off.
For example, it would be disruptive to shut down a switch at the core layer to change a power supply or a fan in the middle of the day when the network usage is at its Peak. To perform a hardware replacement, you could expect to have at least a 10 to 15 minute network shutdown, and that is if you are very fast at performing the maintenance. In more realistic circumstances, the switch could be down for 30 to 45 minutes or more, which most likely is not acceptable. With hot-swappable hardware, there is no downtime during switch maintenance.
Another characteristic one needs to put into consideration is port speed, which at times depend on performance requirements, choosing between fast Ethernet and Gigabit Ethernet Switch Ports.
Fast Ethernet allows up to 100 Mb/s of traffic per switch port while Gigabit Ethernet allows up to 1000 Mb/s of traffic per switch port. Fast Ethernet is adequate for IP telephony and data traffic on most business networks; however, performance is slower than Gigabit Ethernet ports..
Port density is the number of ports available on a single switch. Fixed configuration switches support up to 48 ports on a single device, with options for up to four additional ports.
High port densities allow for better use of space and power when both are in limited supply. If you have two switches that each contain 24 ports, you would be able to support up to 46 devices, because you lose at least one port per switch to connect each switch to the rest of the network. In addition, two power outlets are required. On the other hand, if you have a single 48-port switch, 47 devices can be supported, with only one port used to connect the switch to the rest of the network, and only one power outlet needed to accommodate the single switch.
Modular switches can support very high port densities through the addition of multiple switch port line cards, as shown in the figure. For example, the Cisco Catalyst 6500 switch can support in excess of 1,000 switch ports on a single device.
Switches have different processing capabilities at the rate in which they process data per second. Processing and forwarding data rates are very important when selecting a switch, the lower the processing, the slower the forwarding this results to the switch unable to accommodate full wire-speed communication across all its ports. A normal fast Ethernet port attains a 100Mb/s , while Gigabit Ethernet does 1000Mb/s.
For example, a 48-port gigabit switch operating at full wire speed generates 48 Gb/s of traffic. If the switch only supports a forwarding rate of 32 Gb/s, it cannot run at full wire speed across all ports simultaneously.
The more ports you have on a switch to support bandwidth aggregation, the more speed you have on your network traffic,. e.g. , consider a Gigabit Ethernet port, which carries up to 1 Gb/s of traffic in a network. If you have a 24-port switch, with all its ports capable of running at gigabit speeds, you could generate up to 24 Gb/s of network traffic. If the switch is connected to the rest of the network by a single network cable, it can only forward 1 Gb/s of the data to the rest of that network. Due to the contention for bandwidth, the data would forward more slowly. That results in 1 out of 24 wire speed available to each of the 24 devices connected to the switch.
Power over Ethernet (PoE)
Another characteristic you consider when choosing a switch is Power over Ethernet (PoE). This is the ability of the switch to deliver power to a device over the existing Ethernet cabling. IP phones and some wireless access points can use this feature, you can be able to install them anywhere you can run an Ethernet cable.
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The Cisco 3750 switch has contributed greatly to Cisco's success in the networking hardware market. Its features provide efficient and reliable network switching services. You can find a pre-owned 3750 model at a good price, and if you do buy a pre-owned Cisco 3750 switch, you may need to change the password before you are able configure it to work on your network. Fortunately, Cisco has provided a built-in procedure that allows you to change the password.
Things You'll Need
Cisco 3750 switch and serial cable
Computer with terminal emulation software
How to Change the Password on a Catalyst 3750 Switch？
1. Connect your computer to the 3750 switch using the blue serial cable that typically comes with it. Connect the 9-pin d-shell connector to your computer's serial port, and connect the RJ-45 connector to the switch's console port.
2. Configure a terminal session to the switch. Power up your computer, open a terminal emulator application, and configure a terminal session with the following settings:
1 stop bit
8 data bits
Xon/Xoff flow control
Save the configuration with a name that you can recognize later.
3. Hold down the "Mode" button on the left front of the Cisco 3750 switch, and plug in the power cable. Five seconds after the Stat LED goes off, release the "Mode" button. The SYST LED should start to blink amber.
4. At the command prompt, issue the following commands to the switch to prepare it for the reset procedure, and rename the current configuration file:
rename flash:config.text flash:config.old
5. Boot the 3750 switch by issuing the "boot" command and pressing "Enter." At the "System Configuration Dialog" prompt, answer "n" and press "Enter" twice. This should display the "Switch>" prompt.
6. Issue the "en" command at the prompt, and press "Enter." You should see the prompt change from "Switch>" to "Switch#." Rename the configuration file with the following command:
rename flash:config.old flash:config.text (press "Enter")
Press "Enter" to accept the destination filename default.
7. Copy the configuration file into the 3750 memory with the following command:
copy flash:config.text system:running-config
Press "Enter" when prompted for a destination filename to accept the default.
8. eate new passwords for the 3750 switch with the following commands:
enable secret spswd (spswd = your new secret password)
enable password enpswd (enpswd = your new enable password)
line vty 0 15
password tpswd (tpswd = your new terminal password)
line con 0
password cpswd (cpswd = your new console password)
The 3750 will issue a "Building Configuration" message. When you see the [OK] message at the Sw1# prompt, you have completed the password change for the Cisco 3750 switch.
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