MetroLAN2000: Ethernet/E1/T1/E3/DS3 Fibre Mux

Metrodata Limited

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MetroLAN2000: DS3/E3/E1/T1/Ethernet over Fiber Quotation Request

The MetroLAN2000 converges multiple E1, T1, E3, DS3 and Fast Ethernet services over a fiber. It can also be used by carriers to deliver these services over an SDH or Sonet network.

Datasheet

Multiple E1, E3, DS3 and Ethernet Services over Fiber: MetroLAN2000

Multi-site Multi-service Delivery using the MetroLAN2000

8 x E1/T1 ports mapped into VC-12
3 x E3/DS3 ports mapped into VC-3
8 x 10/100BaseT ports to connect up to 8 remote LAN destinations
Flexible Bandwidth Allocation using Virtual Concatenation with granularity down to VC12
OC-3 or STM-1 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

Application Diagrams
Product Features
Specifications
Order Info
Alternative Products

Multi-site Multi-service Delivery using the MetroLAN2000

This application shows three remote offices connected to a head office. Each site is equipped with a MetroLAN2000 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 VC12 tributaries. A further 10 VC12's are directed to the larger branch office giving 20Mbps bandwidth, whilst 5 VC12's are directed to the smaller office giving a 10Mbps connection.

A full VC3 is required to provision an E3 or DS3 services across an SDH network.

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:

MetroLAN2000/MM for use with multimode fibre (up to 5km)
MetroLAN2000/SMSH for use with singlemode short haul fibre (up to 30km)
MetroLAN2000/SMLH for use with singlemode long haul fibre (up to 70km)

Using fibre optics the MetroLAN2000 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 MetroLAN2000 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 MetroLAN2000 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 VC4, VC3 or VC12 granularity and LCAS support offers maximum benefit to both service providers and users in terms of flexibility and bandwidth optimisation. The MetroLAN2000 supports 8 independent GFP sessions, each of which may be directed to separate remote destinations.

The MetroLAN2000 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 VC12 tributaries. The remaining bandwidth is available to other GFP sessions enabling the full 155Mbps to be utilised.

The MetroLAN2000 supports large frames of up to 4096 bytes and is protocol and payload transparent. The MetroLAN2000 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 MetroLAN2000 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 VC12 for mapping within the remaining Sonet payload.

The MetroLAN2000 includes an E3/DS-3 mapping module which enhances the base level MetroLAN1000 product by means of its ability to map up to 3 E3/DS3 clear channel ports into individual VC3 containers within the Sonet or SDH payload.

The management of the MetroLAN2000 is either local via the console port or remote via the Ethernet management port using SNMP or Telnet, or via a datalink within the 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 MetroLAN2000. 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 VC12
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 VC4, multiple VC3 and/or multiple VC12
LED Support	Link Activity

3 x E3/DS3 User Port (Downlink)
Presentation	3 x BNC, 75 ohm
Mode	Clear Channel
Timing	Internal, Loop, Through, Network
Mapping	To VC3
Alarms	LOS, AIS

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 to 200mA
DC Supply	-36 to -72 VDC, 1000 to 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
MetroLAN2000/MM Multimode	80-12-310	80-24-310
MetroLAN2000/SMSH Singlemode Short Haul	80-12-311	80-24-311
MetroLAN2000/SMLH Singlemode Long Haul	80-12-312	80-24-312