Polycom RMX DOC2548A - Manual (Page 36)

Chapter 1- Hardware Description
1-30
12 Fan Drawer Mandatory
13-16 RTM ISDN/RTM
LAN Either an RTM ISDN or an RTM LAN
card is mandatory in combination with a
Media card. The RTM ISDN/RTM LAN
board must be inserted in a slot opposite
any MPM+ card.
17 RTM-IP 4000 Mandatory
18 Blank Panel Not Available (NA)
19-21 Power Modules Mandatory: 
With AC power, 3 power supplies are
installed, with the 3rd redundant.
With DC power, 2 power supplies are
installed with the 2nd redundant. The
center slot (#20) on the rear of the RMX
4000 is disabled and is fitted with blank
panel.
Note: Protective bonding conductor size
is 14AWG (1.5mm) within the Power
Entry Model.
Table 1-9 RMX™ 4000 Slot Numbering
Slot ID/No. Card/Component Requirement