User manual

Maintaining the LightStream 1010 ATM Switch 4-11
Removing and Installing DC Power Supplies
maintain uninterrupted system operation. In systems with dual power supplies, connect
each power supply to separate DC-input lines; in the event of a line failure, the second
source is still available.
The DC power supply is required by many telcos because their wiring closets are equipped
with DC power outlets. From an operational perspective, the DC power supply has the same
characteristics as the AC version.
The following caution applies to DC-input power supplies:
Caution The LightStream 1010 ATM switch must be installed only in restricted access
areas (dedicated equipment rooms, equipment closets, or the like), in accordance with
articles 110-16, 110-17 and 110-18 of the National Electrical Code, ANSI/NFPA 70.
Note The installation must comply with all applicable codes. In North America,
installation must comply with NEC (ANSI/NFPA 70) and CEC (OArt1, C22.1). Installation
is approved for use with copper connectors only. Make the attachment of the chassis ground
M4 pamnuts to the central office or other interior ground system with a number 8 AWG
copper ground connector as a minimum. The chassis employs two threaded M4x7 chassis
ground M4 pamnuts. These pamnuts must connect directly to the central office or other
interior ground system, and are located on the front of the chassis. The grounded chassis
M4 pamnuts require M4 bolts and locking hardware, which are not included.
Figure 4-7 shows the location of the DC-input power supplies in a redundant configuration.
In a nonredundant configuration, the power supply goes in the slot labeled Power Supply 0.