Lucent Technologies 5 manual Modules Supporting Extensions, Extension Jacks

MERLIN LEGEND Communications System Release 5.0		Issue 1
System Manager’s Guide 555-650-118		June 1997
3 System Components
	Control Unit	Page 3-5
	Line/Trunk and Extension Modules	3

Line/trunk and extension modules have jacks for connecting telephone company lines/trunks and extension wires to the control unit. The system supports 17 types of line/trunk and extension modules. For maximum flexibility, some modules support only lines/trunks, some only extensions, and some a combination of the two.

Each module has a label that contains its name. As noted in Chapter 2, ‘‘About the System’’, the names of the modules identify their capacities and capabilities. The first digit indicates the number of line/trunk jacks a module supports, while the last two digits describe the number of extension jacks it supports. Following the number may be letters that indicate the type of trunk or trunks it supports; for example, LS for loop-startand GS for ground-start. A line/trunk module name with no letter following it supports loop-start trunks. The following are examples of module names:

■The 408 GS/LS MLX module provides four trunk jacks supporting ground-start and/or loop-start trunks and eight MLX extension jacks.

■The 016 module (Release 4.0 and later only) provides 16 extension jacks that, in this case, supply tip/ring (T/R) connections for single-line telephones, modems, voice messaging systems that serve the system as a whole, and other components.

The balance of this section presents some specific information about the modules that connect extensions and the modules that connect lines/trunks. Figure 3–3 and Table 3–1 present summary information.

Modules Supporting Extensions 3

Table 3–1 describes the type of equipment that each module supports. This section highlights some important points about extension modules.

NOTE:

Extension jacks connect to individual telephones and to adjuncts that are attached to extensions. Some adjuncts and applications serve the whole system and connect directly to line/trunk jacks.

Extension Jacks

While the jacks that support MLX extensions and the jacks that support analog extensions may look the same, there is a major difference: an MLX extension jack actually supports two extension numbers at each location served by the jack.

When you use an adapter called a Multi-Function Module in an MLX telephone, you can connect a T/R device (for example, a modem, a fax machine, or an answering machine) to that telephone. Even though a single extension jack on the module serves both the phone and T/R device, each device has its own extension number and operates independently. In contrast, if you want to use both an