Functional Description
150-319-205-05, Issue 5
12
January 26, 2000
ELU-319 List 5E and List 6E
F
UNCTIONAL
D
ESCRIPTION
ADC HDSL technology provides full-duplex services at standard E1 rates over copper wires between an ELU and
an ERU, which comprise one HiGain system. HiGain systems use ADC 2-Binary 1-Quartenary (2B1Q) HDSL
transceiver systems to establish two, full-duplex, 1024 kbps data channels between the ELU-319 and a remotely
located EDU or ERU. This provides a total capacity of 2.080 Mbps between the two units.
A block diagram of the ELU-319 is shown in
Figure 3
. The ELU-319 receives a 2.048 Mbps G.703 data stream
from the G.703 digital cross connect interface. The ELU-319 contains a G.703 frame synchronizer controlled by
an 8-bit microprocessor that determines the type of framing on the G.703 stream and synchronizes to it. The
ELU-319 recognizes Superframe (SF), including D4, or Extended Superframe (ESF) framing. When the data is
unframed, the ELU-319 arbitrarily defines a frame bit.
Figure 3.
ELU-319 List 5E and List 6E Block Diagram
T
IMING
The low loop wander (0.3 UI max) of an ELU-319 List 5E and List 6E, when used with a compatible doubler
(EDU-409), allows the circuit to be used in all critical timing applications, including those that are used to
transport Stratum 1 timing.
