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VoxTechnologies
Enterprise Network Series
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275x
MainStreet Data Termination Units
Alcatel's high performance 275x MainStreet Data Termination Units (DTUs) are
used in many applications that require secure, highly reliable, low speed data
such as automatic banking machines, lottery terminals, low speed router traffic
and alarm monitoring applications (see Figure 1). The 275x MainStreet DTUs are
excellent for extracting maximum performance from existing installed copper
facilities.
275x MainStreet DTUs offer an attractive alternative for providing services
of up to 128 kb/s to remote sites. They are ideal for providing services from a
central site to remote locations over existing twisted pair copper lines. These
products also provide secure, high reliability service over private or leased
lines. Just like their predecessors, the 260x MainStreet DTUs and the 270x
MainStreet DTUs, the 275x MainStreet DTUs are the choice of many carriers and
enterprise customers worldwide.
These products are fully network managed by the Alcatel 5620 Network Manager
(NM) which allows for easy end-to-end path provisioning with only a couple of
mouse clicks.
Three types of DTUs
Three types of DTUs are available - the 2751, 2752 and 2753 MainStreet DTUs with
TIA/EIA-232(RS-232), X.21 and V.35 user ports, respectively. All three DTUs
share a common network port and can be mixed and matched on the same 6- and
12-port line cards. Subrate (<64 kb/s) data is supported and can be
multiplexed onto the same DS0. This multiplexing of data allows for efficient
utilization of bandwidth and real cost savings. Both the 6- and 12-port line
cards can be installed in the 3600 MainStreet and 3600+ MainStreet Multiservice
Bandwidth Managers.
Configuration
The 275x MainStreet DTUs connect to the 3600 MainStreet and 3600+ MainStreet via
the 27LC2 line card or 27LC3 line card, 6- or 12-ports, respectively. The 275X
MainStreet DTUs connect to the line card in any combination up to the line card
port limits. Modules are available that will also allow the 275x MainStreet DTU
to be connected to the 3612 MainStreet Narrowband Multiplexer (NBM), 3624
MainStreet Intelligent T1 Channel Bank (ICB), 3630 MainStreet Primary Rate
Multiplexer (PRM), and the 2902 MainStreet Network Termination Unit (NTU).
The 2751 MainStreet DTU has two TIA/EIA-232 user ports, while the 2752
MainStreet DTU has two X.21 user ports, and the 2753 MainStreet DTU has two V.35
user ports. The speeds and attributes of these ports are software configurable
either locally, via a craft interface, or remotely from the network operations
center via the 5620 NM. The 275x MainStreet DTUs are fully software downloadable
and programmable, making release upgrades and DTU attribute changes easy and
inexpensive.
Diagnostic features
The 275X MainStreet DTUs have many advanced diagnostic features including line
monitoring and power fail detection, open and short detection. Automatic
self-diagnostics, extensive functional displays, automatic reconfiguration of
replaced units, performance statistics and many more features make the
MainStreet DTUs the ideal choice for delivering data services to customers.
Redundancy features
This family of DTUs supports full redundancy on the network interface, the line,
and the DTU itself. These DTUs can be connected to separate ports on the same
line card, on different line cards in the same node, or in different nodes to
give the maximum redundancy service, as illustrated in Figure 2. In redundant
mode, when there are two DTUs at the customer premises, use of a 'Y' cable
presents only a single interface to the CPE device (i.e., a terminal or a
router), which affords additional cost savings.
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