MetroLAN1000: Multiple Ethernet/E1/T1 Fibre Multiplexer

Metrodata Limited

The MetroLAN1000 transports up to 8 E1/T1 and up to 8 Ethernet 10/100BaseT services over a fibre based STM-1/OC-3 service or a dark fibre (e.g. a private fibre connection).
The MetroLAN1000 can be used for carrier service delivery offering product delivering multiple E1 and fast Ethernet services over an SDH network.
Front: MetroLAN1000 - E1/Ethernet over Fibre Rear: MetroLAN1000 E1/Ethernet over Fibre

Multiple E1, T1 and Ethernet Services Over Fibre: MetroLAN1000 (SDH Mux Mode)

MetroLAN1000: Multi-service Delivery over SDH

Multi-service Networking between Multiple Sites

  • 8 x E1/T1 ports mapped into VC-12
  • 8 x 10/100BaseT ports to connect up to 8 remote LAN destinations
  • Flexible Bandwidth Allocation using Virtual Concatenation with granularity down to VC-12
  • STM-1 or OC-3 uplink, with multimode or singlemode fibre interface
  • GFP framing with LCAS support
  • Alarm extension relay
  • RS232 console port
  • SNMP and Telnet remote management
  • Remote configuration and testing of units across the network
  • Simple point to point Fibre Mux Mode available via user interface

Multi-service Networking between Multiple Sites using the MetroLAN1000

MetroLAN1000: Multi-service Delivery over SDH

This application shows three remote offices connected to a head office. Each site is equipped with a MetroLAN1000 that is connected via an OC-3 link to the carrier Sonet network. The head office requires a full OC-3 connection, whilst the remote office sites require only fractional OC-3 connections. Since the bandwidth requirements between the head and regional offices are high, a GFP session is configured to use 100Mbps by concatenating 48 VC-12 tributaries. A further 10 VC-12's are directed to the larger branch office giving 20Mbps bandwidth, whilst 5 VC-12's are directed to the smaller office giving a 10Mbps connection. In this way each of the different sites has guaranteed uncontended bandwidth between each application and between every site.

There are three models in the range:

  • MetroLAN1000/MM for use with multimode fibre (up to 5km)
  • MetroLAN1000/SMSH for use with singlemode short haul fibre (up to 30km)
  • MetroLAN1000/SMLH for use with singlemode long haul fibre (up to 70km)

Using fibre optics the MetroLAN1000 products extend the operating distance for a E1 2Mbps G.703 interface to 5km using low cost multimode fibre, or to either 30km or 70km using singlemode fibre. Despite these quoted maximum operating distances for the MetroLAN products, 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 MetroLAN1000 presents 8 LAN ports which are fully auto-sensing 10/100BaseT interfaces with manual override (e.g. 100M full duplex when connecting to Cisco routers), thereby supporting any LAN network infrastructure. These 8 independent LAN interfaces are separately allocated bandwidth and so there is no contention to worry about. Each of these LAN connections is transported to a remote location via the SDH/Sonet infrastructure.

Generic Framing Procedure (GFP) encapsulation along with virtual concatenation (VCAT) with VC-4, VC-3 or VC-12 granularity and LCAS support offers maximum benefit to both service providers and users in terms of flexibility and bandwidth optimisation. The MetroLAN1000 supports 8 independent GFP sessions, each of which may be directed to separate remote destinations.

The MetroLAN1000 supports IEEE 802.3x flow control on all 10/100 ports to prevent traffic loss when reduced bandwidth is available. Full wire speed forwarding on any GFP session requires 50 VC-12 tributaries. The remaining bandwidth is available to other GFP sessions enabling the full 155Mbps to be utilised.

The MetroLAN1000 supports large frames of up to 4096 bytes and is protocol and payload transparent. The MetroLAN1000 will pass VLAN tagged frames, including "Q in Q" double tagged frames and CISCO ISL, transparently end to end.

To further optimise network utilisation the MetroLAN1000 offers 8 E1/T1 G.703 clear channel port, which are suitable for the transmission of both structured and unstructured data, such as G.704, ISDN PRI. Each E1/T1 may be mapped into an individual VC-12 for mapping within the remaining Sonet payload.

The management of the MetroLAN1000 is either local via the console port or remote via the Ethernet management port using SNMP or Telnet, or via a datalink within the SDH/Sonet overhead channel. Both console and Telnet access methods are password protected, whilst SNMP offer security via community naming. Comprehensive performance statistics are available for all ports. Access via the overhead data link is offered for integration into standard network management schemes. SNMP Version 1 is supported, including MIB2 and traps. SNMP traps will be generated based on alarms for any of the network or user ports. TFTP download of software and configuration data is supported as a means of future-proofing this product.

A pair of changeover relays indicate alarm conditions arising on the MetroLAN1000. The major alarm relay is energised for normal operation to ensure that a fault is signalled in the event of power failure. The integral PSU is fully auto-sensing from 100 to 250 VAC, and -48VDC powered versions are also available.


OC-3/STM-1 Network Port (Uplink)
Presentation Duplex SC Fibre Transceiver
Fibre Options Multimode (11dB)

Singlemode Short Haul (15dB)

Singlemode Long Haul (29dB)
Framing SDH STM-1

Sonet OC-3

8 x E1/T1 User Ports (Downlink)
Presentation 8 x RJ45, (TE pinout with NT conversion dongle supplied)
Mode Clear Channel
Timing Internal, Loop, Through, Network
Mapping To VC-12
Alarms LOS, AIS

10/100BaseT User Ports (Downlink)
Presentation 8 x RJ45, automatic MDI/MDX cross over switching
Mode 10/100BaseT, auto-negotiate, manual
Support 10Mbps, 100Mbps, Half or Full Duplex
Flow Control Full Duplex IEEE 802.3x Pause Frame
Max Frame Size 4096 bytes
Mapping GFP with LCAS & VCAT to VC-4, VC-3 or VC-12
LED Support Link Activity

Environment
Temp 0 - 50 deg C
Humidity 0 - 95% RH, non-condensing
Pressure 86 - 106 KPa

Compliance & Approvals
Safety EN60950
EMC EN55022, EN500082
Management RFC1213 (MIB2), RFC1495 (Telnet), RFC1157 (SNMP), RFC1406 (E1/T1), RFC1215 (Traps)

Power Supply
AC Mains 100 - 250VAC, 50 - 400Hz, 400 - 200mA
DC Supply -36 to -72 VDC, 1000 - 500mA
Power Consumption Less than 40 watts

Packaging (W x D x H mm)
Dimensions 1U, 19 inch rackmount (435 x 213 x 44)

Conformance
Specifications ITU G.707 VCAT

ITU G.7041 GFP

ITU G.7042 LCAS

Configuration & Management
Type Menu driven user interface
Access Local console, Telnet, SNMP
Interface V.24 terminal, User Port, Network Port
Security Access by two level password
System Non-volatile configuration


Part Number
Product 100-250 AC Mains -48 DC Power
MetroLAN1000/MM Multimode 80-12-300 80-24-300
MetroLAN1000/SMSH Singlemode Short Haul 80-12-301 80-24-301
MetroLAN1000/SMLH Singlemode Long Haul 80-12-302 80-24-302

Fibre Converters

STM-1 Converters

OC-3 Converters

E1 Converters

Ethernet Extenders


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