FM4000: Framed E1 to X.21/V.35 Converter

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The Metrodata FM4000 DSU is used to interface high performance DTE equipment such as bridges or routers with X.21 or V.35 interfaces to structured or unstructured E1 G.703/G.704 2.048Mbps leased line services.

Front: FM4000FM4000 AC rearFM4000 AC rear

Fractional E1 (Nx64kbps) G.703/G.704 to X.21/V.35 Converter

FM4000 as Fractional E1 Nx64Kbps to X.21 / V.35 Converter
FM4000 as an E1 G.703/G.704 to Nx64kbps X.21 converter
  • High Spec E1 G.703/G.704 2.048Mbps interface conversion
  • X.21 or V.35 port for router connection
  • Fractional Nx64Kbps support
  • External Alarm relay port
  • Local management port for configuration and diagnostics
  • Remote configuration and testing of units across the network
  • Comprehensive performance monitoring of both device and line
  • Built to European standards
  • Optional remote management using SNMP and Telnet
  • Optional -48 volt DC supply

Router Applications

connecting an X.21 router to an unframed or framed E1 G.703/G.704 leased line

FM4000 connecting an X.21 router to a framed E1 G.704 leased line

This application shows an FM4000 connecting an X.21 router card to an E1 G.703 2.048Mbps leased line, such as a BT Megastream-2 service. X.21 serial ports are often the most cost effective WAN port available on routers. Most Telecom carriers provision E1 2.048Mbps services with G.703 connectivity. Care must be taken to ensure that the remote equipment is configured in a compatible manner (i.e. both ends unframed or both ends framed). If the leased line is framed then the equipment at both ends of the leased line must also be framed.

X.21 routers connected together via an unframed or framed E1 G.703 leased line using FM4000 units

X.21 routers connected together via an unframed or framed E1 G.703 leased line using FM4000 units

This application shows a pair of FM4000 units connecting a pair of X.21 routers via an E1 G.703 2.048Mbps leased line, such as a BT Megastream-2 service. X.21 serial ports are often the most cost effective WAN port available on routers. Most Telecom carriers provision E1 2.048Mbps services with G.703 connectivity. Care must be taken to ensure that the remote equipment is configured in a compatible manner (i.e. both ends unframed or both ends framed). If the leased line is framed then the equipment at both ends of the leased line must also be framed.

FM4000 connecting an V.35 router to an unframed or framed E1 G.703/G.704 leased line

FM4000 connecting a V.35 router to a framed E1 G.704 leased line

This application shows an FM4000 connecting an V.35 router card to an E1 G.703 2.048Mbps leased line, such as a BT Megastream-2 service. X.21 serial ports are often the most cost effective WAN port available on routers. Most Telecom carriers provision E1 2.048Mbps services with G.703 connectivity. Care must be taken to ensure that the remote equipment is configured in a compatible manner (i.e. both ends unframed or both ends framed). If the leased line is framed then the equipment at both ends of the leased line must also be framed.

V.35 routers connected together via an unframed or framed E1 G.703 leased line using FM4000 units

V.35 routers connected together via an unframed or framed E1 G.703 leased line using FM4000 units

This application shows a pair of FM4000 units connecting a pair of V.35 routers via an E1 G.703 2.048Mbps leased line, such as a BT Megastream-2 service. V.35 serial ports are often the most cost effective WAN port available on routers. Most Telecom carriers provision E1 2.048Mbps services with G.703 connectivity. Care must be taken to ensure that the remote equipment is configured in a compatible manner (i.e. both ends unframed or both ends framed). If the leased line is framed then the equipment at both ends of the leased line must also be framed.

LM1100 SNMP Enabler used with Management Data link to manage a pair of FM4000 units

FM4000 remote management using LM1100 and datalink

This application show a remote network management centre controlling the head office FM4000 via an LM1100 SNMP Enabler card allowing comprehensive management access including the full range of configuration changes, diagnostics and status analysis using either SNMP or Telnet, including SNMP traps. In this application a remote management data link has also been enabled to the remote FM4000 unit, allowing remote SNMP and Telnet access into this unit.

The FM4000 offers conversion between an X.21 or V.35 serial interface and an E1 line interface with BNC or RJ45 connector options. The FM4000 supports both unframed and framed (or fractional) operation.

Fractional operation allows a number of 64kbps timeslots to be active, up to a maximum of 31 timeslots for a single E1 line. If timeslot 16 is bypassed, then a maximum of 30 timeslots (channels) can be accommodated.

The FM4000 has several LEDs for displaying current status, plus comprehensive configuration and diagnostics via a menu driven user interface.

It is possible to connect the FM4000 to EIA-530 or RS-449 equipment using conversion cables.

Using a dedicated management timeslot pairs of FM4000s can communicate with each other, allowing configuration and status checking of the remote unit.

The optional Metrodata LM1100 SNMP enabler permits remote management via either Telnet or SNMP.

E1 Line Interface
Port G.703, 75 ohm unbalanced / 120 ohm balanced
Interface BNC (75ohm) / RJ45 (120 ohm)
Framing G.704 (with or without CRC4) or unframed
Line Coding HDB3
Bit Rate 2.048Mbps +/- 50ppm
Barrier Fully compliant as per EN41003
Cable Lengths BNC: RG59 = 600m, UR202 = 750m
RJ45: Belden 8132 = 175m, Belden 9841 = 300m

DTE Interface
Port X.21 or V.35
Interface X.21: ISO4903 15 way female D-type
V.35: ISO2593 34 way M rack
Bit Rate 2.048 Mbps or Nx64kbps (N = 1 to 31)

Configuration & Management
Type Menu Driven
Access System console, Telnet, SNMP
Interface V.24, Ethernet 10 BaseT via RJ45
Security Access by 2-level password
System Non volatile configuration
Clock Modes Internal, Loop, Terminal Timing (CCITT cct113)

Status LEDs & Diagnostic Functions
Loop backs Local loop, Remote loop
strong BERT 2^15-1 PRBS
Statistics Per G.821, 15 min, 24 hour totals
Major Alarm LED LOS, LOF, SQ (E1 port)
Minor Alarm LED AIS, RAI (E1 port)
Data LEDs DTE Tx Data, DTE Rx Data, DTE Fault (X.21/V.35 port)
Test LED Test in progress LED, test configured via diagnostics menu

Power Supply
AC Mains 100 - 250VAC, 50 - 400Hz, 50mA IEC Connector
-48VDC -36 to -72VDC, 200 - 100mA, Buccaneer connector

Packaging
Type 1U 19 inch Rack mount
Dimensions 435 x 213 x 43 mm (W x D x H)

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

Compliance & Approvals
Performance G703, G.704, G.706, G.823
BNC Version OTR.001 2DS, BABT#NS/4043N/P/603813
RJ45 Version CTR12, CTR13, BABT#AA606631
Safety EN41003, EN60950
EMC EN55022, EN50082
Statistics G.821, AT&T54016: 15 min, 24 hour totals
Management RFC1213 (MIB2), RFC1495 (Telnet), RFC1157 (SNMP), RFC1406 (DS1/E1)
MetroDTE MIB (X.21/V.35), RFC1215 (Traps)
Part Number
Product 100-250 AC Mains -48 DC Power
E1 BNC to X.21 80-05-005 80-21-005
E1 BNC to V.35 80-05-006 80-21-006
E1 RJ45 to X.21 80-05-007 80-21-007
E1 RJ45 to V.35 80-05-008 80-21-008
LM1100 SNMP Enabler 14-02-139 14-02-139

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