FM4950: DS3 to HSSI Converter

Close
Contact Me Request


Call Me!

By submitting a request you agree to our Privacy Policy

The Metrodata FM4950 DSU is used to interface high performance DTE equipment such as bridges or routers with HSSI interfaces to unframed 44.736Mbps DS3 leased line services.

Front: FM4950FM4950 rear

DS3 44.736Mbps G.703 to HSSI Converter

FM4950 as an Unframed DS3 to HSSI Converter
FM4950 as an Unframed DS3 to HSSI converter
  • High Spec DS3 G.703 44.736Mbps interface
  • HSSI 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

FM4950 connecting an HSSI router to an unframed DS3 44.736Mbps leased line

FM4950 connecting an HSSI router to an unframed DS3 44.736Mbps leased line

This application shows an FM4950 connecting an HSSI router card to an unframed DS3 44.736Mbps leased line, such as a BT Megastream-45 service. HSSI serial ports are often the most cost effective high speed WAN port available on routers. Telecom carriers provision DS3 44.736Mbps services with G.703 connectivity. Care must be taken to ensure that this equipment is not used with framed DS3 services, such as those available in North America. Care must also be taken to ensure that this equipment is not used in conjunction with cell based E3 equipment, such as some router cards.

HSSI routers connected together via an unframed DS3 44.736Mbps leased line using FM4950 units

HSSI routers connected together via an unframed DS3 44.736Mbps leased line using FM4950 units

This application shows a pair of FM4950 units connecting a pair of HSSI routers via an unframed DS3 44.736Mbps leased line, such as a BT Megastream-45 service. HSSI serial ports are often the most cost effective high speed WAN port available on routers. Telecom carriers provision DS3 44.736Mbps services with G.703 connectivity. Care must be taken to ensure that this equipment is not used with framed DS3 services, such as those available in North America. Care must also be taken to ensure that this equipment is not used in conjunction with cell based E3 equipment, such as some router cards.

The FM4950 offers conversion between an HSSI serial interface and a DS3 line interface with BNC connectors. The FM4950 only supports unframed operation and so should NOT be used with framed DS3 leased line services, or cell based DS3 equipment.

The FM4950 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.

DS3 Line Interface
Port G.703, 75 ohm unbalanced
Framing Unframed
Interface BNC (75 ohm)
Line Coding B3ZS
Bit Rate 44.736 Mbps +/- 20ppm
Cable Lengths RG59 = 130m, UR202 = 160m

DTE Interface
Port HSSI per EIA612, EIA613
Interface 50-way AMP (SCSI II connector)
Bit Rate 44.736 Mbps

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 set-up
Clock Modes Internal, Loop

Status LEDs & Diagnostic Functions
Loop backs NI local loop, NI Remote loop, DTE loop, DTE external loop
Statistics Per G.821, 15 min, 24 hour totals
Major Alarm LED LOS (DS3 port)
Minor Alarm LED AIS (DS3 port)
Data LEDs DTE Tx Data, DTE Rx Data, DTE Fault (HSSI port)
Test 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 ANSI T1.107, T1.107a
Safety UL459, UL950, EN41003, EN60950
EMC EN55022, EN50082, FCC Part 15
Statistics G.821, AT&T54016:15 min, 24 hour totals
Management RFC1213 (MIB2), RFC1495 (Telnet), RFC1157 (SNMP), RFC1407 (DS3/E3)
MetroDTE MIB (HSSI), RFC1215 (Traps)

strong Part Number
strong Product strong 100-250 AC Mains strong -48 DC Power
80-05-018 80-21-018
LM1100 SNMP Enabler 14-02-139 14-02-139

Networking The World Since 1989