Knowledge Center: C
An alphabetical glossary of terms related to Laird's embedded wireless modules.
CAM (Constantly Awake Mode) is a power save mode that keeps the radio powered up continuously to ensure there is minimal lag in response time. This power save setting consumes the most power but offers the highest throughput.
Complementary Code Keying (CCK) is a modulation scheme used with WLANs that employ the IEEE 802.11b specification.
CCKM (Cisco Centralized Key Management) is a Cisco-specific authentication method. CCKM enables quick authentication to avoid a perceptible delay in voice or other time-sensitive applications. SeethisCisco support forumfor additional information.
Cisco Compatible Extensions (CCX) is a certification program from Cisco Systems, Inc. To earn a CCX certification, a client device or client Wi-Fi radio must pass a set of tests to demonstrate interoperability with Cisco Wi-Fi infrastructures and support for Cisco Wi-Fi innovations, which are provided to program participants in a specification. For more information on CCX, visit http://developer.cisco.com/web/ccx/home
Note: For 30AG (MSD30AG and SSD30AG) radio modules, this parameter is disabled. The default is Optimized.
Clinical Decision Support System (CDSS) is computer software designed to help make decisions, such as diagnosis or treatment decisions, based on available data acquired through electronic means.
The CE (Conformité Européenne or European Conformity) Mark on a product indicates that it complies with all safety requirements established by the European Union.
In a Bluetooth Low Energy connection, one of four roles is occupied by a device: Central, Peripheral, Broadcaster, and Observer. The Central role is the Master in a connection and may maintain multiple connections. A Central device pairs with Peripheral devices and acts as the host of a connection. However, when receiving data from a Peripheral device, the Central device acts as a client to the Peripheral and the Peripheral device acts as a data server.
The Central role is most often occupied by a Bluetooth Smart Ready (dual-mode) device. Central and Peripheral roles are the two most commonly used in a Bluetooth Low Energy configuration.
Certs Path is an SCU Global setting that indicates the directory location for certification(s) for EAP authentication and PAC files. A valid directory path can include up to 64 characters.
The SCU default certification path depends on the type of device.
802.11-compliant devices operate on segments of a frequency band referred to as channels. 802.11a, 802.11b, and 802.11g standards specify channels that are 20 MHz wide while 802.11n allows for both 20 MHz and 40 MHz wide channels. 802.11 standards allow for operation at 2.4 GHz and at 5 GHz. In the 2.4 GHz band, regulatory agencies have channels that are 5 MHz wide and 802.11-compliant devices must operate across multiple channels. Because of this, the number of non-overlapping channels in the 2.4 GHz band is more important than the actual number of channels.
|Domain||Frequency Band||2.4 GHz Channels||Non-Overlapping Channels|
|MIC (Japan)||2400-2495 MHz||1-14||4|
Note: When operating in the FCC regulatory domain, 802.11 access points are generally set to channels 1, 6, and 11. In the other domains, channels are generally set to either 1, 6, and 11 or 1, 7, and 13 (with the addition of channel 14 in Japan).
The 5 GHz frequency spectrum is grouped into sets of channels, or bands that are referred to as "UNII" (Unlicensed National Information Infrastructure) bands by the FCC. Each 5 GHz channel is 25 MHz wide and therefore, no channels overlap when operating in 802.11a mode and 802.11n 20 MHz wide mode. The below table identifies the frequency ranges for each of the 5 GHz operating bands as well as the channel numbers for each. The table indicates which bands and channels are available in each of the regulatory domains. Channels that require DFS and those that do not are indicated.
|ETSI (EMEA)||FCC (Americas)||KCC (Korea)||MIC (Japan)||Worldwide|
Note: For countries regulated by FCC, UNII-1 operation is only allowed indoors.
Note: Channel 165 exists as an FCC channel, but tends to provide the shortest range of all 5 GHz channels because it is near the end of the UNII-2 band. For this reason, Channel 165 has traditionally been allocated for use by cordless telephones- those telephones advertised to operate at 5.8 GHz. Many, but not all Wi-Fi providers disable this channel for 802.11a and 802.11n operation due to the shorter range and the mutual interference between cordless phones and Wi-Fi devices that further impact performance and reliability. Laird supports all channels in the 5 GHz operating band except channel 165.
A radio programmed for the Worldwide domain may not be limited to the channels listed in the table above. The radio can use IEEE 802.11d support or Worldwide mode to adapt itself to the channels that are available on the APs in the vicinity.
CKIP (Cisco Key Integrity Protocol) and CMIC (Cisco Message Integrity Check) are Cisco-defined predecessors to WPA TKIP and are supported only on Cisco Wi-Fi infrastructure. An SCU profile setting of CKIP (not CKIP-EAP) means that the encryption keys are defined in SCU. An SCU profile setting of CKIP-EAP means that the encryption keys are derived dynamically from an EAP authentication.
Note: If the SCU active profile has an encryption setting of CKIP or CKIP EAP, then the Laird Wi-Fi radio associates or roams successfully to an access point that is configured with the following:
Note: Laird recommends the use of TKIP or WPA2.
A Class II Permissive Change involves a change that affects the reported performance characteristics and the test data that was submitted for the original approval. For a Class II change, the EUT (Equipment Under Test) must be tested and the test report submitted to the FCC or a TCB for approval before the change can be put into production.
The following situations would require a Class II Permissive Change filing:
The following situations also qualify for a Class II Permissive Change (and do not require a new FCC ID):
CVC is a technology provided by Cambridge Silicon Radio (CSR) which utilises the BC05 internal DSP in order to improve the audio quality of SCO links (speech). This includes sophisticated noise reduction and echo cancellation. CVC works with both single and dual-microphone headsets, giving advanced audio enhancements and noise suppression to the near and far end as well as providing packet loss and bit error concealment.
For the SCU, the device name assigned to the Laird Wi-Fi radio and the client device that uses it.
Windows designation for a serial port. Slow speed method of transferring data from one device to another.
Interface that allows a user to pass command lines (lines of text) to a computer program.
A function in the Laird Technologies Config utility that allows you to compare two or more saved EEPROM files. This can be a very useful tool when analyzing performance of two or more transceivers.
In modems and many wireless radios, Command mode is a mode of operation through which instructions are delivered to the modem or radio that define its operation. Command mode is initiated when the string "AT+++" is sent to the wireless radio, from which point instructions are issued in the form of AT commands. When the string "O" is passed to the radio, it re-enters Data mode.
Command mode is used to initiate connections and alter the settings for those connections, while Data mode is dedicated to the information that two connected radios are exchanging. Command mode is roughly analogous to dialing a phone number, while Data mode is roughly analogous to a conversation between two people once one successfully calls the other.
Note: SCU Admin use only. For more information, see the Wi-Fi Software Administrator's Guide.
Previous term for Profile.
Computerized physician order entry (CPOE) is a process by which a physician may electronically note instructions for nurses or other physicians to fulfill. This enables the orders to be logged in a database and transmitted sometimes to completely different locations.