Connection of ATM-nodes or TV-transmission needs bit error free STM-1 links. For that task, CBL developed LaserLink STM-1. Based on four optical transmitters in latest VCSEL-Laser technology, they have an aperture of 4 x 60 mm in diameter. LaserLink STM-1 is unsensitive to snow, rain and crossing birds. The system has a 1210 nm fiber optic interface.
LaserLink STM-1 is controlled via SNMP/web-based management. Management access runs via IP (Ethernet 10/100BT):
- Permanent supervision and configuration,
- email-alarming,
- long time analysis of the hop,
- simple integration in existing SNMP-NMS like HP OpenView via MIB, supporting RFC1213 and SNMPv1/2.
Technical data LaserLink STM-1
| Bandwidth | | STM1 = 155 Mbit/s |
| Interface | | G.957 S-1.1 |
| Connector | | duplex SC Stecker for 9/125 µm-fibers, 1310 nm |
| Recommended distance | | 50 .. 2000 Meter, depending on climate |
| Optical budget | | at 800 m: 26 dB |
| Maximum attenuation at 800 m | | 32 dB/km |
| Theoretical distance at 10 dB/km atmosph. attenuation | | 1.850 m |
| and at 30 dB/km | | 800 m |
| Minimum line of sight at hop distance | | 500 m at 800 m |
Quality of service (QOS)
| G.821/826 bit error rate | | 10E-9 (unfaded) |
| Delay per terminal | | 10 µsec |
Transmitter
| Multi beam-technology | | 4 x IR-VCSEL |
| Wavelength | | 850 +/- 10 nm |
| Outgoing power | | 4 x 5 mW (eq +13 dBm) |
| Aperture | | 4 x 60 mm diameter |
| Transmitting area | | 113 cm² |
| Divergence | | 6 mrad |
| Laserclass | | 1M, eye-safe |
Receiver
| Diameter | | 257 mm |
| Receiving area | | 520 cm² |
| Acceptance angle | | 5 mrad |
| Typ | | Si-APD-TIA |
| Sensitivity | | -6 .. -43 dBm optical (BER 10E-9) |
| Dynamic range | | 37 dB optical |
| Dry alarm contacts | | yes |
