Section 150-319-251
Revision 01
Page 5
enable the ELU-319 to determine if errors are
present on the channel due to excessive
impairments caused by impulse or crosstalk noise.
7.06
The reconstructed HDSL data channel is
buffered in a first-in-first-out (FIFO) buffer
within the multiplexer. A frequency synthesizer in
conjunction with the buffer regulates the output bit
rate and reconstructs the G.703 clock at the exact
rate received from the remote end. The HiGain
system operates at G.703 rates of 2.048 Mbps with
up to ±50 ppm of offset.
7.07
A G.703 interface driver converts the G.703
channel to a High Density Bipolar 3 (HDB3)
format.
7.08
The transmit and receive G.703 ports have
splitting access and bridging “Bantam”-type
jacks. Connecting one cable between the two BDG
jacks and another between the two LINE jacks splits
the XMT and RCV and creates metallic loopbacks
towards both the customer equipment and the HDSL
line.
7.09
The ELU-319 contains two separate power
converters. The main power supply
converts -48V local battery to logic power for the
ELU-319 circuits. The line power supply converts
the -48V battery to a -130V feed that provides
simplex power feed on the HDSL loops. The line
power can be turned on or off by the microprocessor
and automatically shuts down in the presence of line
short-circuits or microprocessor failure.
7.10
The three most important power demands of
an ELU-319 on the shelf power supply are
its maximum power consumption, its maximum
power dissipation, and its maximum current drain.
These three parameters for the ELU-319, on a per
slot and per shelf basis, are as follows:
Maximum Power Dissipation
Per slot:
8.0W
Per shelf: 176W
Maximum Power Consumption
Per slot:
18W
Per shelf: 396W
Maximum Current Drain
Per slot:
0.423A
Per shelf: 9.3A
Figure 2. ELU-319 Block Diagram. PairGain’s HDSL technology provides full-duplex services at 2.048 Mbps over copper
wires between an ELU-319 and an ERU-412, which comprise one HiGain system.
