Lucent Technologies 5 manual Videoconferencing Systems, Passive Bus

MERLIN LEGEND Communications System Release 5.0	Issue 1
System Manager’s Guide 555-650-118	June 1997

3System Components

Adjuncts Page 3-41

■Inverse Multiplexors (IMUXs). These devices are used to allow data and video communications over two channels or B-channels of a digital facility.

■Other Access Devices. The system also supports connection of the Ascend Pipeline 25-Px access device (Release 4.0 and later systems) or Ascend Pipeline 50 for data communications over digital facilities at 56, 64, 112, or 128 kbps. In addition, the built-in DCE included in some videoconferencing systems is supported.

NOTE:

You cannot connect a DCE to a QCC.

In Release 4.0 and later systems, you can program (see System Programming for more information) an MLX extension jack for 2B data. This allows some communications equipment, such as desktop videoconferencing systems and the Ascend Pipeline 25-Px or Ascend Pipeline 50, to use both B-channels of an MLX extension jack to make and/or receive 2B calls. To use 2B data, the MLX port must be programmed for this capability. Extensions for MFMs or data communications equipment not supporting 2B data, such as ISDN terminal adapters, should not be programmed for 2B data.

Videoconferencing Systems 3

The system supports videoconferencing systems with these types of interfaces and built-in DCE or data communications adjuncts:

■ISDN/BRI. Beginning with Release 4.0, the system supports desktop and group videoconferencing systems that connect to a single MLX port and support speeds of 56 kbps or 64 kbps over digital facilities. Using the system’s 2B Data feature described later in this topic, both B-channels of the MLX port are used to support 2B data calls, at speeds of 112 or 128 kbps (not all video systems support all speeds). These installations do not require separate data communications equipment (DCE).

■V.35. Older group video systems with a V.35 use either an inverse multiplexor (IMUX) or two ISDN terminal adapters as their DCE. Some systems include the DCE, and some require separate data communications equipment. With a V.35 interface, a video system must be connected to two MLX extension jacks; it uses the adjunct extensions of each jack to send and receive video calls over two B-channels at speeds of 112 or 128 kbps, depending on the video system and digital facility.

Passive Bus

Some desktop videoconferencing systems allow the extension to include an MLX telephone connected directly to the desktop video system. In this configuration, the desktop video system can use both B-channels for 2B data video calls, as long as the MLX telephone is not making or receiving a call.