Lucent Technologies 6.1 manual Guidelines for Digital Extension Jacks

MERLIN LEGENDCommunications System Release 6.1		Issue 1
System Planning 555-661-112		August 1998
5 Data Communications
	Assigning Extension Jacks	Page 5-22
	Guidelines for Digital Extension Jacks	5

Although only one logical ID is assigned to each digital extension jack, the system automatically assigns two extension numbers:

■The first extension number shown on Form 2a is assigned to an MLX telephone connected to the extension jack.

■The second extension number assigned to each jack is reserved for an adjunct, such as an ISDN terminal adapter data terminal or desktop video endpoint, connected to the MLX telephone.

■If a personal or group video system is connected to the MLX port, extension numbers are assigned to the video system for use in 2B Data connections.

Both extension numbers are assigned automatically, whether or not the extension includes an ISDN terminal adapter. Calls can be placed to both extension numbers independently. Note that an MLX extension cannot have both an ISDN terminal adapter and an MFM.

Also, when configuring digital data equipment connections to an MLX port, the following requirements and/or restrictions must be applied:

■If using a 7500B data module as an ISDN terminal adapter, and it is the only ISDN terminal adapter data station on the MLX port (no MLX telephone is connected), a 440A4 terminating resistor adapter must be configured to provide 100-ohm termination for each transmission pair. The 7500B data module does not provide termination.

■An MLX telephone is independent from the ISDN terminal adapter; however, the telephone may cause channel conflict between the telephone and the ISDN terminal adapter when the telephone is voice-signaled while active on a call. If a slight chance of data call blocking is unacceptable, an MLX telephone should not be connected to an ISDN terminal adapter used in a data station configuration.

■The maximum cord length from an MLX telephone to an ISDN terminal adapter is 80 feet (24 meters). This should be considered if you plan to use the voice capability of a port by connecting an MLX telephone far from the ISDN terminal adapter.

■Do not connect an ISDN terminal adapter that does not support 2B Data to an MLX port that has been programmed as a 2B Data port.

■When using the 008 MLX or 408 GS/LS-MLX module for data or video, you must use Version 28 of the module.