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6 64179008APL1-5A
Quad H2LIU
The Total Access 1000 DAT Quad H2LIU is a
network terminating common plug-in unit used to
terminate the HDSL2 circuit over 2-wire metallic
facilities. See Figure 7. The Quad H2LIU terminates
the HDSL2 signals originating from the H2TUCs and
hands off an ATM DS1 IMA signal to the ATM BCU.
Each HDSL2 local loop operates as an independent
subsystem, each operating over a single twisted pair.
The Quad H2LIU communicates over these two
twisted pairs to the Total Access 1000 H2TUCs
located at the CO.
ATM BCU
The Total Access 1000 DAT Bank Controller Unit is a
common module plug-in unit. See Figure 8. The unit
inserts directly into the BCU slot on the Total Access
1000 DAT shelf. The unit terminates the ATM DS1
IMA from the H2LIU and provides distributed
bandwidth to the access module slots upon request.
The ATM BCU provides all control functions for the
Total Access 1000 DAT common units and access
modules. The front panel has one DB-9 connection, a
network status LED, and a TEST status LED.
The Total Access 1000 DAT ATM BCU provisions,
operates, monitors, and tests all Total Access 1000
DAT access modules. The ATM BCU provides the
ATM switching fabric for the system.
1179109L1
QUAD H LIU
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Figure 7. Total Access 1000 DAT Quad H2LIU
ATM BCU
1179112L1
NETWORK
TEST
A
D
M
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Figure 8. Total Access 1000 DAT ATM BCU