NEC SL2100 Main Expansion Chassis

Base unit (0/0/0) with 5 slots (one reserved for the CPU), possibility of connecting additional 2 expansion cabinets. 
1 dedicated slot for CPU / VOIP / cabinet expansion; 
4 slots for internal cards and lines 
Dimensions: 330mm x 435mm x 93mm (wxhxd) 
Can be wall or rack mounted 19 "(requires rack shelf code

Maximum capacity: 

Total number of lines: 126 

• Analog: 36 
• ISDN BRI: 48 
• PRI: 90 
• IP: 64 

Total number of extensions: 128 

• Digital: 72 (*) 
• Analogue: 96 
• IP: 112
• * does not support digital phones on the cards installed on slot 4 of each cabinet