FM4850: E2 to HSSI Converter

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The Metrodata FM4850 DSU is used to interface high performance DTE equipment such as bridges or routers with HSSI interfaces to 8.448Mbps E2 leased line services.

Front: FM4800FM4800 rear

E2 8.448Mbps G703 HSSI Converter

FM4850 as an E2 to HSSI Converter
FM4850 as an E2 to HSSI converter
  • High Spec E2 G.703 8.448Mbps interface
  • HSSI port for router connection
  • 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

FM4850 connecting an HSSI router to an E2 8.448Mbps leased line

FM4850 connecting an HSSI router to an E2 8.448Mbps leased line

This application shows an FM4850 connecting an HSSI router card to an E2 8.448Mbps leased line, such as a BT Megastream-8 service. HSSI serial ports are often the most cost effective high speed WAN port available on routers. Telecom carriers provision E2 8.448Mbps services with G.703 connectivity.

HSSI routers connected together via an E2 leased line using FM4850 units

HSSI routers connected together via an E2 leased line using FM4850 units

This application shows a pair of FM4850 units connecting a pair of HSSI routers via an E2 8.448Mbps leased line, such as a BT Megastream-8 service. HSSI serial ports are often the most cost effective high speed WAN port available on routers. Telecom carriers provision E2 8.448Mbps services with G.703 connectivity.

LM1100 SNMP Enabler used with Management Data link to manage a pair of FM4850 units

FM4850 remote management using LM1100 and datalink

This application show a remote network management centre controlling the head office FM4850 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 FM4850 unit, allowing remote SNMP and Telnet access into this unit.

The FM4850 offers conversion between an HSSI serial interface and an E2 line interface with BNC connectors.

The FM4850 has several LEDs for displaying current status, plus comprehensive configuration and diagnostics via a menu driven user interface.

Using a dedicated management channel pairs of FM4850 units 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.

E2 Line Interface
Port G.703 75ohm interface
Framing G.742 or unframed
Interface BNC (75ohm)
Line Coding HDB3
Bit rate 8.448 Mbps
Cable Lengths RG59 = 300m, UR202 = 370m

DTE Interface
Port HSSI per EIA612, EIA613
Interface 50 way AMP (SCSI II connector)
Bite Rate 8.328 Mbps (Line framed)
8.448 Mbps (Line unframed)

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

Status LEDs & Diagnostic Functions
Loop backs NI local loop, NI remote loop, DTE loop, DTE external loop
BERT 2^15-1 PRBS
Statistics Per G.821, 15 min, 24 hour totals
Major Alarm LED LOS, LOF, SQ (E2 port)
Minor Alarm LED AIS, RAI (E2 port)
Data LEDs DTE Tx Data, DTE Rx Data, DTE Fault (HSSI 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, G742, BABT#NS/4043/I/R/60455
Safety EN41003, EN60950
EMC EN55022, EN50082
Statistics G.821, AT&T54016: 15 min, 24 hour totals
Management RFC1213 (MIB2), RFC1495 (Telnet), RFC1157 (SNMP), RFC1406 (E2/DS1/E1)
MetroDTE MIB (HSSI), RFC1215 (Traps)
Part Number
Product 100-250 AC Mains -48 DC Power
80-05-014 80-21-014
LM1100 SNMP Enabler 14-02-139 14-02-139

Networking The World Since 1989