Interface Converter: FM4950
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DS3 44.736Mbps G.703 to HSSI Converter
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.
DS3 to HSSI Interface 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
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.
Router Applications
- HSSI router to DS3 45Mbps G.703 leased line conversion
- Connecting pairs of HSSI routers over a DS3 45Mbps G.703 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.
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.
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 |
| 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 | EMC EN55032, 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 | |
| Product | AC Mains | DC Power |
| FM4950 DS3 - HSSI | 80-05-018 | 80-21-018 |
| LM1100 SNMP Enabler | 14-02-139 | |
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