Front: LH1000 Ethernet over serial
Rear: LH1000 Ethernet over serial

Ethernet over serial: HSSI,RS-232,EIA-530,X.21,V.35,RS449 or V.36

The Metrodata LH1000 enables the transmission of LAN frames across satellite links via serial modems.

Please Note:

The LH1000 product has now been superceded by the much more flexible and fully manageable MetroCONNECT LHM1000 product which offers advanced functionality. The LH1000 is no longer available.

LAN Extension over Satellite

  • Must be used in pairs.
  • LAN extension over satellite links
  • 10 / 100BaseT auto-negotiating LAN port
  • Filtering of local packets
  • Efficient HDLC packet handling on WAN port
  • HSSI interface at up to 100 Mbps
  • Multi-standard serial interface supports RS-232, X.21, EIA-530,V.35, V.36 at up to 20 Mbps
  • Mixed Tx and Rx interface operation e.g. HSSI Tx & EIA-530 Rx
  • Asymmetric operation
  • Easy to install & maintain
  • Integral auto-sensing power supply (100-250V AC or -40V DC versions)
  • 12-24V DC power supply available on request
  • Compact modem style unit, built to European standards
  • Rack mounting kits for 2 or 18 units available
LH1000: Ethernet to HSSI/EIA530
Ethernet to HSSI/EIA530

The LAN interface is auto-sensing and supports 10M, 100M, full or half duplex working. Manual selection of 100BaseT FD operation enables connection to fixed config router ports. It is presented as an RJ45 connector and offers automatic MDI/MDI-X interface selection to obviate the need for cross-over cables. The LAN interface utilises an efficient HDLC encapsulation with address learning and filtering at up to 148810 packets per second. Rate decoupling is supported by means of a 1000 packet SDRAM buffer store, and no packets are lost providing that the sustained data rate is below the DTE serial port speed.

Two DTE ports are provided. They can operate at asymmetric speeds since they are clocked using the DCE supplied Send & Receive Timing signals. The ports are:

  • a high speed HSSI DTE port using a standard 50-way SCSI-2 connector at a DCE clock rate of up to 100Mbps
  • a low speed multi-standard DTE port (e.g. EIA530) using a 44-way D-Type connector at clock rates up to 20Mbps

The low speed multi-standard port offers the options of RS-232, EIA-530, X.21, V.35, RS449/V.36 interfaces, depending upon the type of interface cable fitted to the port. See the Order Info tab for details of the cables that Metrodata supply for use with the LH1000.

HSSI Interfaces on Satellite Modems can go as high as 90Mbps, but typically HSSI is only used up to 51.84Mbps or STS-1. This is the "theoretical" maximum speed of HSSI (also known as EIA/TIA612). This limitation is due to router HSSI Modules unable to go any faster than 52Mbps. The other problem with running HSSI at high speeds is that the line driving capability is drastically reduced with higher data rates. With the LH1000 it is possible to support an Asymmetric Satellite service with HSSI used for the higher rate and EIA530 used for the lower rate. This can be a more cost effective solution than buying 2 x HSSI Satellite Modems.

The LH1000 supports a maximum packet size (MTU) of 1536 bytes which is sufficient to transport double VLAN tagged frames (Q-in-Q).

The LH1000 can easily be rack mounted in either a 1U two unit rack mount kit, a 6U eighteen unit rack mount kit.

LH1000 offering an Ethernet service over EIA530 and HSSI satellite equipment
LH1000 offering an Ethernet service over EIA530 and HSSI satellite equipment

This application shows an LH1000 offering Ethernet services over EIA530 and HSSI satellite modem equipment. The LH1000 supports high speed satellite modems with HSSI interfaces at data rates up to 110Mbps, or lower speed satellite modems with serial interfaces such as EIA530 at data rates up to 20Mbps. The LH1000 will even work with separate satellite modulators and demodulators even if these have different interface types (e.g. a HSSI satellite modulator and an EIA530 satellite demodulator).

LH1000 offering an asymmetrical Ethernet service over multiple EIA530 and HSSI satellite modems
LH1000 offering an asymmetrical Ethernet service over multiple EIA530 and HSSI satellite modems

This application shows how an asymmetrical Ethernet service can be delivered over satellite, using LH1000s and Cisco Catalyst switches. In this example a single HSSI satellite modulator is used to multi-cast the transmit data with multiple lower speed satellite links using EIA530 satellite demodulators being used for the return paths.

Subscriber Port
Presentation 10/100BaseTX, RJ45, Auto-MDI / MDIX
LED Support Link / Activity & Speed
Operating Mode Auto-negotiate 10/100, Full or Half Duplex
Port Filtering Mode 148810 packets per second
MAC Address Table 4096 Entries
Packet Size 64 bytes minimum
1536 bytes maximum
WAN Ports (Satellite Modem)
Multi-standard upto 20Mbps HSSI upto 100Mbps
Presentation 44 way D type50 way AMP
Frame Mode UnframedUnframed
Timing DCE SuppliedDCE Supplied
Encapsulation HDLCHDLC
Max Packet Size 37900143410
LEDs Tx / Rx PacketTx / Rx Packet
Compliance & Approvals
Safety EN41003, EN60950
Power Supply
-48 VDC Supply -40 to -72 VDC, 165 - 95mA
AC Mains 100 - 250 VAC, 50 - 60Hz, 65 - 28mA, IEC Connector
Power Consumption 6.5 watts approx when operating
Temp 0 - 50 deg C
Humidity 0 - 95%, non-condensing
Pressure 86 - 106 KPA
Type Modem, 1U high without feet, IP30C
Dimensions ( W x D x H mm )
Rack mount 202 x 132 x 44 (without feet)
Tabletop 202 x 132 x 48 (with feet)
Part Number
Product AC Mains DC Power
2 Unit Rack mount Kit80-05-25680-05-256
18 Unit Rack mount Kit80-05-25080-05-255

Ordering Information for LH1000 interface cabling

Multi Standard Interface
Cable Length EIA-530 DTE X.21 DTE V.35 DTE V.36 DTE RS-232 DTE
1.5m Cable80-415-000280-415-000680-415-000880-415-000480-415-0010
3.0m Cable80-43-000280-43-000680-43-000880-43-000480-43-0010

Product variants with 12V to 24V DC operation are also available on request.

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