Front: WC155/SMLH Ethernet to STM1/OC3
Rear: WC155/SMLH Ethernet to STM1/OC3

LAN over Sonet OC-3/SDH STM-1 SMLH

The WC155/SMLH LAN extender provides high performance LAN extension over fibre function. The WC155/SMLH is virtually a 'plug and play' device with configuration options selectable on bit switches, in the unlikely event that non default operation is required.

Please Note:

The WC155 product has now been superceded by the much more flexible and fully manageable MetroCONNECT WCM5100 product which offers advanced functionality at a cost-effective price point.

The WC155 is no longer available.

LAN Extenstion over STM-1/OC-3

  • Must be used in pairs
  • Feature rich LAN extension over fibre
  • Auto-negotiating 10/100BaseT subscriber port, with auto MDI/MDIX switching
  • Wire speed forwarding of remote packets
  • Wire speed filtering of local packets
  • SONET OC-3/SDH STM-1 framing with GFP WAN port
  • Easy to install & maintain
  • Integral auto-sensing power supply (100-250V AC or -40V DC versions)
  • 12-24V DC power supply available on request
  • External alarm relay port
  • Compact modem style unit, built to European standards
  • Rack mounting kits for 2 or 18 units available
WC155 Ethernet over STM-1/OC-3 Extender
WC155/SMLH Ethernet over STM-1/OC-3 Extender

With the need to extend, or interconnect, communication infrastructures over greater distances, and the cost of fibre falling dramatically, the Metrodata WC155/SMLH Fibre Converter product range provides a cost effective solution for the extension of Ethernet networks over STM-1/OC-3 services.

The WC155/SMLH has a 10/100BaseT user port, supporting auto-negotiation and automatic MDI/MDI-X crossover switching by default, though full manual control is available via bit switches. The user port will perform MAC address based filtering of local packets and will forward all other packets. The WC155/SMLH offers full wire speed, full duplex operation even for minimum 64 byte packets, which for 100baseT is 148810 packets per second. In more complex installations using VLANs, the WC155/SMLH supports large frames up to 1536 bytes thereby allowing the transport of VLAN tagged packets.

The WAN port is presented as a duplex SC fibre port with a choice of fibre transceivers available. This port supports either SONET OC-3 or SDH STM-1 framing at 155Mbps. LAN traffic is transported using the GFP (Draft Rev 2 ANSI T1X1.5) standard which requires the full OC-3 or STM-1 bandwidth to transport the user LAN traffic.

There are three models in the range:

Using fibre optics the WC155/SMLH extends the operating distance for a 10/100baseT interface to 70km using singlemode fibre. Despite this quoted maximum operating distance, specific installations may only operate over lower distances due to the variations in losses of different types of fibre cable, the use of connecting fibre cables, or patch panels. When operating over 50% of the maximum distances it is advisable to calculate all fibre optic connector and cable losses and compare these with the fibre optic loss budget specified for this product.

The WC155/SMLH supports a maximum packet size (MTU) of 1536 bytes which is sufficient to transport double VLAN tagged frames (Q-in-Q).

For critical applications, an external alarm relay is provided to indicate power failure and WAN port alarm conditions. LEDs also indicate unit status.

The standard WC155/SMLH is supplied with SC fibre connectors and operates at a nominal wavelength of 1300nm. Other wavelengths are available on request, e.g. 850nm, 1550nm, 1550/1300 WDM. Other connector options are also available on request, e.g. ST, FC.

The WC155/SMLH has integral mains or 0 volt power supply, and can be desktop or rack-mounted. The WC155/SMLH range can easily be rack mounted in either a 1U two unit rack mount kit, a 6U eighteen unit rack mount kit.

The WC155/SMLH is part of a range of products from Metrodata, offering fibre conversion solutions ranging from 2Mbps up to 155Mbps for electrical to fibre conversion, or 155Mbps, 622Mbps or Gigabit Ethernet for fibre mode or wavelength conversion.

WC155/SMLH Ethernet over Long Haul Singlemode STM-1/OC-3
WC155/SMLH as a 10/100baseT over Long Haul Singlemode STM-1/OC-3 Extender

This application shows how a pair of WC155/SMLH units can be used to connect a 10/100baseT Ethernet link across an STM-1/OC-3 leased line service delivered using long haul singlemode fibre.

Subscriber Port
No. of Ports 1
Presentation 10/100 Base TX, RJ45, Auto-MDI/MDI-X
LED Support Link / Activity & Speed
Operating Mode Auto-negotiate for 10/100, Full or Half Duplex with Manual override
Port Filtering Rate 148810 packets/second
Port Switching Rate 148810 packets/second
MAC Address Table 4096 entires
Packet Size 64 bytes minimum, 1536 bytes maximum
WAN Port Specs
Mode Singlemmode long haul 8/125um
Presentation Dual SC fibre
Wavelength 1310nm
Loss budget 29dB
Framing Sonet OC-3 or SDH STM-1
Data Rate 155.52Mbps
Encapsulation GFP over OC-3/SPE or STM-1/VC4
Timing Internal or Loop
Diagnostics Fibre loop or Ethernet loop
Type Modem, 1U high without feet, IP30C
Dimensions WxDxH mm
Rack mount 202 x 132 x 44 (without feet)
Desktop 202 x 132 x 48 (with feet)
Temp 0 - 50 deg C
Humidity 95% RH, non-condensing
Pressure 86 - 106 KPA
Power Supply
AC Mains 100-250VAC, 50-60Hz, 60-24mA IEC Connector
-48VDC -40 to -72VDC, 200-100mA

Please Note:

The WC155 product has now been superceded by the much more flexible and fully manageable MetroCONNECT WCM5100 product which offers advanced functionality at a cost-effective price point.

The WC155 is no longer available.

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