Term
| What does Fecc stand for. |
|
Definition
|
|
Term
| What is the cisco video enabled base model? |
|
Definition
|
|
Term
| What 3 things need to be configured for Video calls to work? |
|
Definition
1)Proper PVDM installed in gateway
2)MRGL's need to configured in CUCM
3) Call Admission Control for quality |
|
|
Term
|
Definition
| Low Latency Queuing. Applies strict rules to specified gateway traffic. |
|
|
Term
|
Definition
| Cisco Unified Video Advantage. Adds video to ipphones and ip comunicators. |
|
|
Term
|
Definition
| Automated Alternate Routing. Used as a redundancy option to reroute failed calls. |
|
|
Term
|
Definition
| AAR is configured in CUCM at the individual device level or in the device pool. |
|
|
Term
|
Definition
| Resource Reservation Protocol. Network wide Quality of service and call admission control. |
|
|
Term
| How does the CUVA Application work? |
|
Definition
1)Uses CDP to locate the ipphone
2)Uses sccp proxy to signal to and from the phone.
3)Communicates with phone through a CAST Tunnel. (Cisco audio session tunnel) |
|
|
Term
|
Definition
| Call Admission Control. Voice protocol that uses queuing, buffering, and packet drop decisions to resolve network congestion. |
|
|
Term
|
Definition
| Class Based Weighted Fair Queuing. |
|
|
Term
| What are the CBWFQ Markings? |
|
Definition
Used to recognize traffic payload.
EF Marking Tag) Marks all "Voice" packets.
AF41 Marking Tag) Marks all "video" traffic.
AF31 Marking Tag) Marks all "signalling" traffic. |
|
|
Term
| How does CBWFQ specify que settings? |
|
Definition
Classes) Criteria configured that are matched in the class to inherit the queuing settings.
Bandwidth) Guaranteed Amount of banndwidth during congestion.
Weight) Used to determine which packets will take precedence in congestion within a class
Tail Drop)Used to tell the gateway when to start dropping packets |
|
|
Term
| How is CBWFQ applied to a network link? |
|
Definition
Uses specific protocols, access control lists, and input interfaces to match criteria in a class profile.
http://www.cisco.com/en/US/docs/ios/12_0t/12_0t5/feature/guide/cbwfq.html |
|
|
Term
| Why doesn't CBWFQ work well with Voice traffic. |
|
Definition
| By default CBWFQ will use WFQ. Using this there is no settings for time-sensitive traffic such as voice. |
|
|
Term
| How to apply CBWfQ to voice traffic. |
|
Definition
| CBWFQ must be used in tandem with Low Latency Queuing to deliver packets as fast as possible. |
|
|
Term
| How to apply CBWfQ to voice traffic. |
|
Definition
| CBWFQ must be used in tandem with Low Latency Queuing to deliver packets as fast as possible. |
|
|
Term
| Why doesn't CBWFQ work well with Voice traffic. |
|
Definition
| By default CBWFQ will use WFQ. Using this there is no settings for time-sensitive traffic such as voice. |
|
|
Term
| Why doesn't CBWFQ work well with Voice traffic. |
|
Definition
| By default CBWFQ will use WFQ. Using this there is no settings for time-sensitive traffic such as voice. |
|
|
Term
| How do you debug and trouble shoot CBWFQ or LLQ settings? |
|
Definition
1)"show queue" interface-type interface-number
2)"Debug Priority"
3)"Show Policy" Interface Interface-Name |
|
|
Term
| Where is the CBWFQ marking made on a packet? |
|
Definition
| The EF,AF41,AF31 markings are made to the first 6bits of the "ToS" of the packet header. |
|
|
Term
| What are the main video codecs? |
|
Definition
| H.261, H.263, H.263+, H.264 |
|
|
Term
| What are video codec speeds? |
|
Definition
| 64kb/s to 3mb/s (typically a couple mb/s on the high end.) |
|
|
Term
| Where is the total bandwidth allowed configured? |
|
Definition
| Configured in the region settings of CUCM |
|
|
Term
| What is a Cisco Video Conferencing MCU? |
|
Definition
| Multi-point Control Unit. |
|
|
Term
|
Definition
| MCU3200 Series which is small video networks up to MCU5300 for larger Video networks |
|
|
Term
| How many Video streams are in a single video call? |
|
Definition
| There is a outbound stream and an inbound stream in a successful video call. |
|
|
Term
| What are the two different types of MCU network setups? |
|
Definition
1)Centralized where the MCU would be installed at the publisher site.
2)Cascading where each subscriber in the cluster has their own |
|
|
Term
| What are common Video stream Characteristics? |
|
Definition
Two-Way
One-Way
One-to-Many |
|
|
Term
| Which kind of dsp is used to transcode video stream on a gateway? |
|
Definition
| PVDM3-64 or higher for a hetero network and PVDM3-16 for a homo video network. |
|
|
Term
| What is the difference between a Homogeneous video conference and a heterogeneous conference? |
|
Definition
1)Homo - Same codec end to end
2)Hetero - 2 different codecs end to end |
|
|
