Dc Powered Systems; Making Alternate Power Connections - ADTRAN Total Access 850 System Manual

Total Access 850 System Manual

DC Powered Systems

The DC powered Total Access 850 comes equipped with a DC Power supply to furnish the voltages
necessary for proper backplane operation. As shipped, the Total Access 850 is set to factory default
conditions. After installing the chassis and any access modules, the Total Access 850 is ready for
power-up.
• This unit shall be installed in accordance with Article 400 and 364.8 of the NEC NFPA
70 when installed outside of a Restricted Access Location (i.e., central office, behind a
locked door, service personnel only area).
• To comply with GR-1089-CORE, Issue 3, this equipment MUST only be installed in a
DC-C bonding and grounding environment. It may not be utilized in a DC-I (isolated)
bonding and grounding environment.
• Power to the Total Access 850 DC system must be from a reliably grounded -48 VDC
source which is electrically isolated from the AC source.
• The branch circuit overcurrent protection shall be a fuse or circuit breaker rated
minimum 48 VDC, maximum 20A.
• A readily accessible disconnect device, suitably approved and rated, shall be
incorporated in the input source wiring.
• Maximum recommended ambient operating temperature is 45

Making Alternate Power Connections

For wire-wrap or screw terminal connections, the rear cover does not need to be removed; only the
terminal access cover needs to be removed. Make wire-wrap or screw terminal connections as follows:
1. Unscrew the access cover hold-down screw.
2. Slide the access cover down slightly to disengage the lock-tabs from their slots.
Use wire gauge suitable for the application.
3. Identify the wire-wrap pins designated for use, and make the connections starting with the pins
closest to the exit port to avoid wiring interference as work progresses.
4. If alternate power connection to P7 is to be used, make those terminal connections last.
5. Carefully route wiring through the exit port.
6. Position and align the access cover tabs to the slots; insert the tabs and slide the cover up slightly
until the screw holes are aligned. Ensure that exit wiring is not pinched or damaged.
7. Reinsert the hold-down screw.
64203376L1-1B © 2004 ADTRAN, Inc.
Section 3 Network Turnup Procedure
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