Crocus HDSL

  • The HDSL modem is designed to work at 2 Mbit/s without repeaters over up to 7.8 km on standard twisted-pair cables ( 0.6 mm)
  • Modular Plug-in DTE interfaces for maximum flexibility and efficient stock management
  • 2-pair versions and 3-pair versions for longer distances
  • Fully compliant to ETSI ETR 152
  • Embedded channel for extensive management
  • Partial fallback supported in case of line problems
  • Central site high density card nest for up to 30 modems

The Crocus HDSL(High bit rate Digital Subscriber Line) is a new-generation manageable baseband modem for E1 digital subscriber lines or private copper networks. The Crocus HDSL integrates the high performance HDSL technology into a product designed to cover long distances at 2 Mbit/s over unshielded twisted pairs without the need for expensive repeaters or pair selection. Therefore, the Crocus HDSL re-enhances the value of the installed copper base to a large extent.

A large set of different plug-in interface boards makes the Crocus HDSL ideal for interfacing with almost every application. One can use not only traditional serial interfaces like V.35, V.36, and X.21 (available for both 2 Mbit/s and Nx64 Kbit/s operation) but also G703 (transparent or with G.704 framing) and direct Ethernet 10BaseT connections. All these interface boards can be exchanged in only a few seconds, so flexibility is maximised.

For large concentration sites, rack-mount versions are mounted in a standard 19î card nest and can offer densities of up to 30 modems per nest. Both 230/115 Vac and direct 48 Vdc powering can be used.

In addition, all Crocus Modems in the network can be managed in an integrated way by an elaborated high-performance integrated management system (HP Openview®). An embedded auxiliary channel on the communication link transmits the management information to remote modems rapidly and efficiently.

Packet Switched Backbone Access

Leased Line service with Digital Cross Connect

Direct Ethernet Interconnectivity

The integrated management allows one to configure the modem remotely, to query the actual status of the modems, to permanently monitor the performance (real-time and statistical information), to conduct fault analysis, and to report alarms to the operator.

In order to optimise the service on the installed network, Telindus offers a free Windows® based maintenance package. It is a valuable tool for the field engineer as it supports full configuration and troubleshooting.

Typical applications for the Crocus HDSL are in carrier environments (high-speed local loop access), railways, campus networks, hospitals and highways. The Crocus HDSL is ideally suited for high-speed backbone access, LAN to LAN and PBX to PBX connections, as well as for imaging and other bandwidth-demanding applications.

In the event of line problems, the Crocus HDSL can disable the faulty pairs and continue with a reduced bandwidth on the remaining pairs (fractional E1). Furthermore, the Crocus HDSL 2p Twin-CV (two modems on one board in a card nest) supports a full and rapid back-up facility to back-up one 2-pair link by means of a continuously available second 2-pair link. The Crocus HDSL is available as a desktop unit or as rack-mounted card (each in a 2-pair or 3-pair version).


Line interface

  • up to 3 pair + shield (screw connections)
  • impedance : 135 ohm
  • coding : 2B1Q conform ETSI ETR 152
  • line speed/pair : 2E1: 1168 kbps/3E1: 784 kbps
  • throughput : 300 sec
  • transmit level : 13.5 dBm
  • G.704 Time Slot prioritisation (G.704 Mode)
  • fractional E1 support
  • performance (distance covered noise free)
Wire diameter (mm) 2-pair version (km) 3-pair version (km)

Digital interfaces

  • Field exchangeable
  • V.35, V.36, X.21 (2Mbps)
  • V.35, V.36, X.21 (Nx64 kbps)
  • G.703 (G.704 framing possible)
  • Ethernet Bridge 10baseT
  • RS-530 (with passive adapter cable)
  • Different versions: see appropriate leaflets

Management interface

  • Desktop versions: 9600 Bps asynchronous (subD 9-pin)
  • Rack-mount versions:
    Synchronous High speed bus (RJ45)
    9600 Bps asynchronous (subD 9-pin)

Auxiliary channel interface

  • Transparent asynchronous 2400 user data channel

Front panel

Testloops AL: Analogue Loop
RDL: Remote Digital Loop
DL: local Digital Loop
ET: Integrated Error test generator
Indications PWR: Power
TST : Test indicator (circuit 142)
AIS ERR :Alarm Indication Signal (G.704) / Error Test error indication / Local alarm signalling indication
SQ1-SQ3: Signal quality indication per line pair
TXD: Transmit Data (circuit 103)
RXD: Receive data (circuit 104)

Mechanical data

  • Desktop versions:
    H x W x D: 50 x 200 x 350 mm
    weight: 2 kg
  • Rack-mount versions:
    H x W x D: 235 x 20 x 300 mm
    weight: 1 kg
  • Cardnest CN4:
    H x W x D: 6U x 19î x 350 mm
    weight: 6.1 kg

Environmental Requirements

  • Ambient operational temperature: 0C to 40C
  • Storage temperature: -10C to +70C
  • Maximum altitude: 3000 m
  • Relative humidity: 10% to 90% non-condensing

Power Requirements

  • Desktop versions:
    230Vac +/-10% 50-60 Hz : 60 mA
    115Vac +/-10% 50-60Hz : 120 mA
    48Vdc (40.5Vdc - 57Vdc) : 170 mA
  • Rack-mount versions:
    48Vdc (40.5Vdc - 57Vdc) : 170 mA (Twin: 240 mA)

Desktop version (G.703 interface mounted)

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