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