FM4950: DS3 to HSSI Converter

Metrodata Limited

The Metrodata FM4950 DSU is used to interface high performance DTE equipment such as bridges or routers to an unframed 44.736Mbps DS3 service. The DTE equipment presents an HSSI interface.

DS3 to HSSI Converter

FM4950 DS3 to HSSI Converter

  • High Spec DS3 G.703 44.736Mbps interface
  • HSSI Data port
  • External Alarm relay port
  • Remote configuration and testing of units across the network
  • Comprehensive performance monitoring of both device and line
  • Optional SNMP management
  • Optional -48 volt DC supply
  • Built to European Standards

The FM4950 can be used at either end of the Wide Area link. Error conditions and usage statistics are gathered and stored by the FM4950. Unit set-up is done via a comprehensive menu system which is accessed from a local or remote terminal.

The optional Metrodata LM1100 SNMP Enabler permits management via a LAN using an SNMP system.

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 Lenghts DS3 BNC RG59 = 130m
DS3 BNC UR202 = 160m

DTE Interface (HSSI 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, DS3 loop

Status LED & Diagnostics

Loobacks NI local loop, NI Remote loop, DTE loop, DTE external loop
Statistics Per G.821, 15min, 24hour totals
Major Alarms LOS
Minor Alarms AIS
Data DTE Tx Data, DTE Rx Data, DTE Fault
Test Test via menu, Test LED on front panel

Power Supply

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

Packaging

Type 1U 19inch Rackmount
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, 24hr totals
Management RFC123 (MIBII), RFC1495(Telnet), RFC1157(SNMP), RFC1406(DS1/E1), Metro MIB(DSU), RFC1215(Traps)

Part Number
Product 100-250 AC Mains -48 DC Power
FM4950 DS3 - HSSI 80-05-018 80-21-018
LM1100 SNMP Enabler 14-02-139 14-02-139

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