Section 3: Installing Extensions and Trunks
Aspila EX Hardware Manual Section 3: Installing Extensions and Trunks 3-9
3
INSTALLING TIE LINES
Tie Line: 4TLIU
! Important !
• When using the TLIU PCB, the PBX and Earth grounds must be connected as described on
page 1-32 or the trunks will not function correctly.
Installing 2-wire/4-lead Tie Lines:
1. For each trunk, run two-pair cable from the PSTN Network Termination point to the TLIU
PCB. Refer to Tie Line (4TLIU) PCB (Figure 2-14) (page 2-28) for details of the RJ61 con-
nector pin outs.
Note that two pins of the RJ-61 connector are not used for 2-wire tie lines.
2. Make sure the strapping on the 4TLIU PCB is set to the proper type (2-wire or 4-wire and
Type I, II, III, IV or Type V).
3. Plug in the corresponding RJ-61 connector to the 4TLIU PCB connector.
RJ61 Cable Connector - 4-Wire E&M, CN100 - CN400
Pin No. Connection Description
1 SB Ground wire for control
2 M Control signal to trunk
3
4 R Voice signal both ways
5 T Voice signal both ways
6
7 E Control signal from trunk
8 SG Ground wire for control
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