Featured Products by Lucent Technologies

Line Interface Modules for the
Stinger DSL Access Concentrator

The line interface modules (LIMs) for the Stinger DSL access concentrator provide physical data link support, ATM multiplexing and (optionally) frame relay-to-ATM conversion from subscriber lines. They interface through the Stinger chassis midplane to line protection modules (LPMs), which in turn provide connection for the incoming lines. As many as 14 LIMs supporting any mix of xDSL access technologies can be housed in a Stinger chassis. Carriers and service providers can also choose to populate a chassis with LIMs of a single xDSL type. With up to 48 SDSL ports or 12 ADSL ports per LIM and two purpose-designed ASIC traffic multiplexers on each LIM, the line interface modules help give Stinger its unmatched port density and speed.

Choice of line interface modules
broadens revenue-generating opportunities

Because LIMs are available for all of the most popular DSL types, carriers and ISPs are able to broaden revenue-generating opportunities by serving a wider range of subscribers. The combination of LIM modularity and port density gives carriers who specialize in a single kind of DSL access the opportunity to generate extra revenue as well, by expanding their existing customer base.

The LIM types available today or in the near future include:

  • 48-port SDSL
  • 12-port ADSL-DMT (Full-rate and G.Lite)
  • 24-port ADSL-DMT (Full-rate and G.Lite)
  • 32-port ADSL-DMT (G.Lite only)
  • 24-port HDSL-2
  • 24-port IDSL
  • 12-port ADSL-DMT with ISDN Voice

Advanced hardware architecture gives each LIM
unsurpassed performance and throughput

Each LIM has a Motorola 860 processor that works with dual proprietary ASICs to keep traffic flowing smoothly between CPE and trunk lines. These ASICS perform policing, prioritization and other important elements of the QoS functionality, then aggregate and forward ATM traffic to the Stinger control module (which provides switching capabilities for the Stinger).

  • Multiplexing and demultiplexing
  • Cell input and output
  • Policing
  • Input buffering capacity of 64K cells
  • Output buffering capacity of 64K cells
  • Prioritized output queuing
  • Explicit forward congestion indication
  • Early packet discard
  • Partial packet discard
  • Peak cell rate shaping

TAOS operating system provides on-board intelligence for
sophisticated, yet easy-to-use operation

The Motorola 860 processor on every LIM runs under the familiar Lucent True Access Operating System (TAOS). At work in thousands of Lucent access concentrators, routers and switches all over the world, TAOS gives Stinger its management and control capabilities. It enables the LIMs to perform such functions as modem initialization, SNMP agent participation and statistics gathering.

Redundancy feature ensures LIM availability

Stinger makes service providers and carriers more successful by making their networks more robust. LIM redundancy helps achieve high network availability. One or more of the 14 LIM slots in the Stinger chassis can be used to house a spare. If one or more LIM ports should fail, the corresponding ports on a redundant LIM can take their place in an exclusionary arrangement.

Future-proof design keeps pace with strides in technology

As DSL chip technology advances, so will Stinger. The LIM has been designed to adapt readily as newer, smaller, lower power chips become available. Whether the chip advances enable higher port densities, or offer support for new DSL types (such as VDSL), Stinger will be able to accommodate them.


Specifications for Lucent Stinger DSL Access Concentrator

Dimensions
Height: 15 in. (38.1 cm)
Width: 1.06 in. (2.69 cm)
Depth: 5 in. (12.7 cm)

Power Requirements
48-port SDSL:
62.4 W @ 784 Kbps or 1.5 Mbps
81.6 W @ 2.3 Mbps

12-port ADSL:
62.4 W

Operating requirements
Temperature: 32° to 122° F (0° to 40° C)
Relative Humidity: 10% to 95%
(non-condensing)
Operating Altitude: Up to 10,000 ft
(3050 m)

EMC/RFI compliance
FCC Part 15 Class A, CISPR Class A

Physical connectors
USOC RJ21X 50-pin telco connector (Must meet JIS C5973 standards)

Interface standards
ANSI T1.601, T1.413.2,
T1E1.4/94-006
Bellcore TA-NWT-001210


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