Mitel MX-ONE Installation Instruction page 37

I B
NSTALLING OARDS AND
4.6
4.7
37
C
ABLING
Figure 26: ELU31/4 - location of switch
ANALOG EXTERNAL LINES, TLU80 AND TLU83
Analog external lines are connected to analog TLU boards.
TLU8x
TLU 8x
Figure 27: TLU8x - MDF example
DIGITAL EXTERNAL LINES
Note: If the ISDN T1 interface shall be connected outside the premises, it is mandatory
to connect the T1 lines via a Network Terminal 1 (NT1), Channel Service Unit
(CSU) or National Certified Terminal Equipment (NCTE) interface. This is
essential in order to comply with US and CA regulatory safety requirements in
force.
21/1531-ASP11301 Uen C 2017-03-28