Glossary
GL-6
Cisco TelePresence System Administration Guide
OL-21845-01
J
jitter
jitter call
jitter period
Variation in packet transit delay caused by queuing, contention, and serialization effects on the path
through the network. In general, higher levels of jitter are more likely to occur on either slow or heavily
congested links.
Jitter call is the average jitter measurement per call. Shown in the Jitter/Call output field as part of Per
Call Jitter and Packet Loss Reporting.
Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal
characteristic that varies regularly with time. Jitter frequency, the more commonly quoted figure, is its
inverse.
The CTS measures jitter every 10 seconds. The Jitter/Period field reports the jitter measurement for the
last 10-second period.
The CTS calculates jitter as the sum of the maximum deviation (both late and early) from the expected
arrival time as given by the frame period. CMA computes frame jitter based on the arrival time of the
last packet of a frame.
L
LCD
Liquid crystal display. The LCD display is an accessory for the Cisco Digital Media Player (DMP) for
use in your digital signage network or your enterprise TV network. It is used for displaying video,
images, or computer data during a Cisco TelePresence meeting. See the
Cisco LCD Professional Series
Displays
home page on Cisco.com for more information.
See also
DMP
.
LED
Light-emitting diode. Indicators on the CTS that determine whether the user is sitting within camera
range.
light temperature
A theoretical means of describing visible light that is determined by comparing its hue with a heated
black-body radiator. The lamp’s color temperature is the temperature in kelvins at which the heated
black-body radiator matches the hue of the lamp.
Live Desk
The Live Desk is a person who has been assigned to a Cisco TelePresence
endpoint
to assist you with
problems that may occur during a meeting. To connect to Live Desk, press the Live Desk softkey. If a
Live Desk has not been assigned to your Cisco TelePresence
endpoint
, the following message is
displayed on your phone screen: “There is no Live Desk number configured”
Live Desk is configured in the Configure > Live Desks Window of the CTS-Manager Administration
interface. See the
Cisco TelePresence Manager Installation and Configuration Guide
on Cisco.com.
LTRP
Long Term Reference Picture.
