Orion 2000
Inverse Multiplexer for ATM (IMA)

  • Grow your business on your schedule–no need to
    wait for DS-3/E3 or OC-3c/STM-1 connections

  • Minimize turn-up time and cost by utilizing
    existing T1/E1 infrastructure

  • Enjoy industry-leading features and functions to
    make deployment and management easier

  • Simplify management with powerful performance
    monitoring, alarm reporting, and diagnostics

  • Deliver a wide range of services across affordable
    and accessible ATM WAN connections


  • Backhauling DSLAM traffic

  • MPEG2 video applications

  • ATM trunking and UNI/NNI extension

  • ATM LAN interconnection via switches or routers

  • Remote ATM workstations

  • Native ATM service

™ Larscom's Orion 2000 provides standard-based Inverse Multiplexing over ATM (IMA), offering connectivity up to 12 Mbps over T1 lines, or up to 16 Mbps over E1 lines. The Orion 2000 is ideal for applications where higher-rate ATM WAN connections are either unavailable or cost prohibitive. Built to central office standards, the Orion 2000 is equally suited to private ATM LAN interconnection and deployment by Network Service Providers. The Orion 2000 offers superior traffic management, with an exceptionally large 1 MB buffer divided into four queues (a total of 16,384 cells) to effectively handle high-rate bursts. Sizes and thresholds for three of the queues, plus discard and congestion-management options, are user configurable for optimal performance. Sophisticated ASCII terminal and SNMP management interfaces enable local or remote configuration, performance monitoring, alarm notification, and diagnostic testing. The Orion 2000 is interoperable with all leading DSLAMs, IMA concentrators, ATM core switches, and routers, ensuring you a proven, readily-available, rock-solid IMA solution for a wide range of applications .

The basic function of the Orion 2000 is to interconnect ATM devices point-to-point across a wide area using multiple T1/E1 lines. Virtually any ATM device (e.g., routers, switches, DLSAMs, hubs, workstations) can be interconnected, as long as each has a DS3, E3, or OC-3c/STM-1 UNI/NNI port. Use of inverse-multiplexed T1s or E1s for the WAN link provides major cost and availability benefits over DS3, E3, or OC-3c/STM-1 ATM WAN links.


Scalable bandwidth — Up to 8xT1 or 8xE1
Large 1 MB buffer — Divided into 4 queues to handle "bursty" ATM traffic
Certified NEBS compliant
Co-location ready — -48 V dc or ac power
Easy management — Powerful performance monitoring, alarm reporting, and diagnostics
T1 — 4 or 8 lines; per AT&T PUB 62411; DB15 male connectors; 0, -7.5, or -15 dBm LBO; 1.544 Mbps ±32 ppm; B8ZS or AMI; ESF per AT&T PUB 54016, ANSI T1.403
E1 — 4 or 8 lines; balanced 120 ohm per ATM Forum E1 Physical Interface specification; DB15 male connectors; 2.048 Mbps ±50 ppm; HDB3; with or without CRC
Inverse Multiplexing Mode — Cell-based per ATM Forum IMA Specification 1.0, April 1998
T1/E1 Alignment — 1 to 8 T1s or E1s; 1 ATM link group; ITC or CTC mode
Differential Delay — T1: 0 to 125 ms; E1: 0 to 100 ms
DS3 or E3 — DS3 or E3 UNI or NNI per ATM Forum (DS3=44.736 Mbps ±20 ppm; E3=33.368 Mbps ±20 ppm); internal and loop clocking; PLCP (DS3; E3-G.751 only) or HEC (DS3; E3-G.751 & G.832) framing; B3ZS coding; C-bit parity; 75-ohm BNC connectors (DSX-3-3 per ANSI T1.404)
OC-3c — OC-3c/STM-1 multimode fiber UNI or NNI per ATM Forum (155.52 Mbps ±20 ppm, 1270 to 1380 nm); internal and loop clocking; SC duplex connector; -14.0 to -20.0 dBm transmit power; -14.0 to -29.0 dBm receive sensitivity; payload scrambling
Traffic Prioritization — 16,384 cells total; 4 queues; 3 configurable queues for CBR, VBR, and UBR traffic
Congestion Management — User-defined discard on queue thresholds, CLP-marked cells, EPD for AAL-5; EFCI


Access — Two RS232 ports (ASCII, 1200 to 38,400 baud; DB-9 male DTE, SLIP); one Ethernet port (IEEE 802.3 10Base-T, RJ45); user-specified VPI/VCI (optional)
Modes — SNMP, Telnet, and TFTP; menu-based ASCII interface
SNMP MIBs — MIB II, DS1/E1, DS3, E3 (RFCs 1213, 1406, 1407); IMA (SNMP V1); Larscom MIBs
Self-Test — Basic diagnostics at power-up or restart; Ping and SNMP Trap by user command
Performance Monitoring — 24-hour registers for T1 or E1 (G.804), IMA, and UNI parameters; user-configurable alarms on unit, T1/E1, IMA, and UNI performance parameters
Loopbacks — Local and remote T1/E1, DS3/E3/OC-3c, and cell loops
Power — Auto-ranging 100/240 V ac, or -48 V dc office battery; typically consumes 25 watts
Dimensions — 3.5 x 17 x 12.5 inches (8.8 x 43.2 x 31.8 cm); brackets for 19- or 23-inch rack
Environment — 32 to 113 °F (0 to 50 °C); up to 80% relative humidity, non-condensing
Regulatory Compliance — FCC Parts 15 & 68; UL 1950; EN60950; EN55022 (Class A); EN50082-1; CE compliance with EU directives