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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Lines/Trunks
Page 3-5Identifying Line/Trunk Jacks
3
Planning Form Instructions 3
Refer to the completed Control Unit Diagram on Form 1 to mark line/trunk jack
types on Form 2c:
1. For each module with line/trunk jacks noted in the Control Unit Diagram
(beginning with Slot 01), write in the type of module and its slot number in
the Module Type and Slot No. column of Form 2c; after the appropriate
Log. ID number, draw a line to indicate the logical IDs (and therefore, the
line/trunk jacks) that correspond to that module.
If the system has 100D (DS1) modules, keep in mind that even though the
module has only one physical jack, the 100D module supports up to 24
endpoints. Therefore, 24 logical IDs and associated line/trunk numbers are
assigned to each module.
The 800 NI-BRI module supports up to 16 endpoints, therefore 16 logical
IDs and associated line/trunk numbers are assigned to each 800 NI-BRI
module even though the module has only eight physical jacks.
2. In the Jack Type column of Form 2c, for all modules except 100D modules,
write the jack type for each logical ID. Use the codes shown in Table 3–2
.
Table 3–2. Codes for Line/Trunk Jacks
3. For systems that include a 100D module, do
one
of the following in the
Jack Type column:
■ If the module will emulate trunks or will be used for digital data
transmission, write the appropriate jack type code (see Table 3–2
)
for the channels being used (for example,
T1-LS, T1-TIE, or T1-S56),
or write
T1 if the channels are not being used at this time.
■ If the module will connect services (such as, Megacom and
Megacom 800), write
PRI for all 24 logical IDs of PRI-type modules.
You may now match incoming trunks to the available jacks as described in the
next section.
1. T1 Switched 56 digital data is also available using T1-Tie trunks. See the “Tie Trunks”
section later in this chapter.
Jack Type Code Line/Trunk Type
LS Loop-start
GS/LS Ground-start/loop-start
DID DID
Tie Tie
T1-GS DS1 connectivity used to emulate GS
T1-LS DS1 connectivity used to emulate LS
T1-Tie
1
DS1 connectivity used to emulate tie or for digital data service
T1-DID DS1 connectivity used to emulate DID
T1-S56 DS1 connectivity used for digital data
PRI DS1 connectivity used for PRI service
BRI NI-1 BRI