NEC SL 1000 Technical Training Manual page 6

Appendix : Notice for No.4 KSU
No.4 KSU (No.3 Expansion KSU) has following limitations.
Any trunk (Analog, ISDN BRI/PRI) does
Power Failure circuits are not available because of no trunks support.
Multi-Line Terminals, SLTs and DSS Consoles work but Door phone and Relay do
Due to the cable length limitation, installation position of No.4 KSU must be careful.
Expansion cable is special design and can NOT be extended by yourself to avoid any transmission error.
Cable length is
not enough!!
Page 6
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NOT work.
No.3 Exp KSU
(1632ME KSU)
No.2 Exp KSU
(1632ME KSU)
No.1 Exp KSU
(1632ME KSU)
Main KSU
(1632M KSU)
NEC Confidential
Newly
added
NOT
No.2 Exp KSU
(1632ME KSU)
No.1 Exp KSU
(1632ME KSU)
Main KSU
(1632M KSU)
No.3 Exp KSU
(1632ME KSU)
work.