Paradyne 8820, Installation Manual

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1. Introduction
1-4
November 2004 8820-A2-GN20-80
RADSL, ReachDSL, IDSL, SDSL, ATM SDSL, ATM ADSL, TDM SDSL, and TDM
SHDSL cards are generically referred to as line cards in this document.
Table 1-1 shows which line cards can be used with the different SCP card, MCP,
and SCM configurations.
8820 BAC Features
The 8820 BAC has the following special features:
„
Dual Power Access
The BAC provides both front and rear power access, each capable of
accepting two independent DC power inputs. Front power access is made
through two Power Entry Modules (PEMs), located on the front of the chassis.
Rear power access is made on the back of the chassis, directly to the
backplane-mounted screw terminals located behind two removable metal
covers. At the option of the user, the DC power input connections can be made
either through the two PEMs on the front, or through the screw terminals on
the rear of the chassis, as long as both are not used at once. However, for
ease of maintenance, rear connection is recommended.
Two PEMs are available:
— Model 8820-S2-903 accepts –48 VDC input
— Model 8820-S1-906 accepts –48 VDC or –60 VDC input
„
Power Redundancy
The two PEMs mounted in the front of the chassis provide power redundancy.
If one power source fails, the other PEM provides all of the power needed by
the system. This happens automatically without system disruption.
NOTE:
When using either front or rear power access, two separate power
sources must be provided to enable the power redundancy function of the
chassis. Also, the PEMs must be installed even though rear power is used.
Table 1-1. Line Card Interoperability
SCP Card SCP Card and MCP SCM and MCP
8955
8965
8968
8985
8995
8997 8775
8777
8779
8799
8955
8965
8968
8985
8995
8997 8303
8304
8312
8314
8335
8343
8344
8355
8365
8373
8374
8385
8777
8779
8799