Table 5: Dc Power Entry Module Features; Figure 4: Sr-12 Dc Power Entry Module; Dc Power Entry Modules - Alcatel 7750 SR-12 Installation Manual

DC P E
OWER NTRY
DC PEMs are easily installed and removed from the rear 7750 SR-12 chassis power slots 1 and 2.
One PEM can support the full system current requirements if you are operating the SR-12 without
power redundancy. For redundancy, two PEMs must be installed and powered on at all times.
Always operate an energized chassis with the safety cover installed over the DC power terminal
block to prevent contact with hazardous voltages and currents and to prevent accidental removal.
Power cables are not included. You must provide power cables compliant with your local safety
codes. For information about preparing cables, refer to
There are no field replaceable parts on a DC PEM. The entire unit must be replaced in the event of
a failure.

Table 5: DC Power Entry Module Features

Key
1
2
3
4
5
7750 SR-12
M
ODULES
1
2
3

Figure 4: SR-12 DC Power Entry Module

Power cable (VDC)
Return cable (RTN)
Safety cover
I / O (On/Off) switch (accessible without removing safety cover)
DB-25 connector (provides status if AC power is used)
4
Description
7750 SR-12 Overview
DC-Input Power Wiring on page
5
SR12003
69.
Page 27