FM4800: E2 to X.21 Converter

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The Metrodata FM4800 DSU is used to interface high performance DTE equipment such as bridges or routers with X.21 interfaces to 8.448Mbps E2 leased line services.

Front: FM4800FM4800 rear

E2 8.448Mbps G.703 to X.21 Converter

FM4800 as an E2 to X.21 Converter
FM4800 as an E2 to X.21 converter
  • High Spec E2 G.703 8.448Mbps interface
  • X.21 port for router connection
  • External Alarm relay port
  • Local management port for configuration and diagnostics
  • 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

FM4800 connecting an X.21 router to an E2 8.448Mbps leased line

FM4800 connecting an X.21 router to an E2 8.448Mbps leased line

This application shows an FM4800 connecting an X.21 router card to an E2 8.448Mbps leased line, such as a BT Megastream-8 service. X.21 serial ports are often the most cost effective WAN port available on routers. Telecom carriers provision E2 8.448Mbps services with G.703 connectivity.

X.21 routers connected together via an E2 leased line using FM4800 units

X.21 routers connected together via an E2 leased line using FM4800 units

This application shows a pair of FM4800 units connecting a pair of X.21 routers via an E2 8.448Mbps leased line, such as a BT Megastream-8 service. X.21 serial ports are often the most cost effective WAN port available on routers. Telecom carriers provision E2 8.448Mbps services with G.703 connectivity.

The FM4800 offers conversion between an X.21 serial interface and an E2 line interface with BNC connectors.

The FM4800 has several LEDs for displaying current status, plus comprehensive configuration and diagnostics via a menu driven user interface.

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

E2 Line Interface
Port G.703, 75 ohm unbalanced
Interface BNC (75ohm)
Framing Unframed
Line Coding HDB3
Bit Rate 8.448Mbps +/- 30ppm
Cable Lengths RG59 = 300, UR202 = 370m

DTE Interface
Port X.21
Interface ISO4903 15 way female D-type
Bit Rate 8.448Mbps

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

Status LEDs & Diagnostic Functions
Loop backs NI local loop, NI remote loop, DTE loop
BERT 2^15-1 PRBS
Statistics Per G.821, 15 min, 24 hour totals
Major Alarm LED LOS (E2 port)
Minor Alarm LED AIS (E2 port)
Data LEDs DTE Tx Data, DTE Rx Data, DTE Fault (X.21 port)
Test LED Test in progress LED, test configured via diagnostics menu

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

Packaging
Type 1U 19 inch Rack mount
Dimensions 435 x 213 x 44 mm (W x D x H)

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

Compliance & Approvals
Performance BS6328, G703, G823, BABT#NS/4043/I/P/603917
Safety EN41003, EN60950
EMC EMC EN55032
Statistics G.821, AT&T54016: 15 min, 24 hour totals
Management RFC1213 (MIB2), RFC1495 (Telnet), RFC1157 (SNMP), RFC1406 (E2/DS1/E1)
MetroDTE MIB (X.21), RFC1215 (Traps)
Part Number
Product 100-250 AC Mains -48 DC Power
80-05-013 80-21-013
LM1100 SNMP Enabler 14-02-139 14-02-139

Networking The World Since 1989