Compressed Video Network (CVN) Guidelines
2. Connection, Disconnection and Support Procedures
2.1 Connection Set-up
2.1.1 Adhering to Time and Schedule
All class connections must be established based on a network schedule which is centrally maintained. All classes must strictly adhere to the schedule.
- Connections for point-to-point classes must begin no later that nine minutes before the class start time.
- Connections for multi-point classes must begin no later than 29 minutes before the class.
- At five minutes before the start of the video class, (20 minutes in cases where a multi-point class is being conducted), the LSPs should contact each other to verify connection has been completed or to resolve the connection problem.
2.1.2 Dialing Protocol
The schedule will designate which is the initiating site and what telephone numbers are to be dialed. In the case of multi-point calls, all remote sites are responsible for dialing into the MCU at the number designated on the schedule.
2.2 During The Class
2.2.1 LSP Availability
The LSP must be on site during the class at the telephone number provided on the schedule.
2.2.2 Loss of Connection
In certain instances, a connection will be lost during a class. If such an event occurs during a multi-point call, the LSP is responsible for reconnecting to the MCU. For point-to-point calls, the site detecting the failure must call the other site via telephone and negotiate the reconnection.
2.2.3 Transmission Problems
If transmission problems occur during a class, the detecting site should contact the LSP at the other site(s) to identify and resolve the problem. If the problem cannot be resolved by the LSPs, one or both LSPs should contact the BSP for assistance.
For multi-point calls, the detecting LSP should contact the BSP who coordinates with the appropriate LSPs and others to resolve the problem.
The LSP should not interrupt the class, if at all possible, to resolve transmission problems that arise. Instead, the LSP should use a telephone to communicate with the LSP or BSP.
Once the connection is established, all sites should echo train their systems. This is most important for multi-point classes. The LSP of the originating site has the responsibility of coordinating this task.
For multi-point calls, it is imperative that audio systems are working properly. The MCU switches video based on audio generated by the sites. Erratic switching may occur if a site is generating spurious audio. Open microphones are not allowed on multi-point calls. The site must use audio switching technology, push to talk microphones, or staff a microphone mute system so as to not have an open microphone. In any case, audio from a site should only occur when a question or comment needs to be transmitted from that site.
2.3 Disconnection Procedures
The LSP MUST break connections, or ensure that they are broken, promptly at the scheduled time. If connections are not disconnected promptly at their scheduled time, they may effect the set-up of a class somewhere else on the network.
There is no excuse or exception to not disconnecting a class at the scheduled time.
2.4 Canceling a Class Session
When classes are canceled for one or a few class sessions, the LSP for the class has the responsibility to contact the other LSPs (and BSP) as soon as it is known.
The Video NOC is operational during all scheduled class times.