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DPGS 0+8 (II)
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The critical questions a service provider asks prior
to choosing a digital pair gain system for connecting
subscribers in areas with limited copper infrastructure
are:
· How many customers can be connected
on a single pair?
· What is the maximum loop length?
· Will it support advanced services
such as caller ID, payphones etc.?
· Will it interfere with other deployed
in-bundle broadband services?
· Will it operate in harsh environmental
conditions?
· Can the system add capacity economically?
· What are the added costs involved
in installation, inventory management
and support?
Extel's 8-channel digital pair gain system provides
the value-for-money solution to all questions posed
above.
There are a number of 4-channel and 10/12-channel
systems in the market at present. However, these
may not be suitable for a number reasons such as,
legacy systems with inadequate future growth potential,
sufficient subscriber range, etc. Selecting a single
solution reduces ongoing operational and management
costs.
The DPGS 0+8 (II) uses TC-PAM coding at 520 kbps
on the digital link and will not interfere with
DSL or other broadband services in adjacent pairs.
Whilst 10 channels and above comply with ITU-T 991.2
standard, the interference levels exceed that of
ISDN recommendations and is hence considered to
be unacceptable by forward thinking network managers.
TC-PAM can reach almost 20% further than the older
2B1Q versions. Hence the transmission distance of
the Extel 8 channel system is comparable to that
of a 4-channel 2B1Q system even though the bandwidth
is higher.
The DPGS 0+8 (II) has been designed to be a cost
effective solution without sacrificing performance
and reliability. The design meets stringent over-voltage
and over-current protection standards - ITU-T K.45,
supports pay phones on all lines and is transparent
to all the usual CLASS services such as caller line
identification.
The Remote Unit electronics are enclosed in a totally
waterproof enclosure so that the housing can be
located permanently, exposed to the elements on
a pole or wall. The Remote Unit does not require
an earthed connection and therefore the total installation
cost is reduced. The Remote Unit can also be located
underground, using a totally hermetically sealed
housing.
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