Nortel Modular ICS 6.0 Installer's Manual page 227

Inserting a cartridge / 227
Tips -
On a midi system, ports 3 and 4 can be used for
Trunk Modules or Station Modules. In this case, connect Trunk
Modules beginning at the top (port 4). Connect Station
Modules beginning at the bottom (port 3).
On a maxi system, ports 3 through 8 can be used for Trunk
Modules or Station Modules. In this case, Trunk Modules
should be connected beginning at the top (port 8) and working
down. Station Modules should be connected beginning at the
bottom (port 3) and working up.
On a fully expanded 12-port (mega) system, connect Trunk
Modules beginning at the top (port 8) and working down.
Station Modules would be connected beginning at the bottom
(port 3) and working up. Trunk Modules cannot be connected
to the Expansion Cartridge in slot 1.
When no more Station Modules can be added to the Expansion
Cartridge in slot 2, connect additional Station Modules to the
Expansion Cartridge in slot 1, beginning at the bottom (port 9)
and working up.
Two-port Expansion Cartridge
ICS (modules 1 and 2) TM4 SM3
ICS (modules 1 and 2) TM4 SM3
P0992638 03 Modular ICS 6.0 Installer Guide