Laser Link for PDH - LaserLink 4E1
Perfect suited for E1-transmission (2,048 Mbit/s) is the LaserLink 4E1. Up to four independent S2m/E1-signals can be connected via copper cable. Four LED generate a transmitting aperture of 4 x 60 mm in diameter. For that reason the link is very robust against snow, rain and crossing birds.
LaserLink 4E1 is suited for connection of microcells or base stations in GMS / UMTS networks.
SNMP/web-based out-band-management is available via IP (Ethernet 10/100BT) access:
- 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 4E1
| Bandwidth | 4 x E1 = 4 x 2.048 Mbit/s | |
| Interface | G.703 | |
| Connector | Sub-D25, 120 Ohm | |
| Recommended distance | 50 .. 2000 Meter, depending on climate | |
| Optical budget | at 800 m: 29 dB | |
| Maximum attenuation at 800 m | 36 dB/km | |
| Theoretical distance at 10 dB/km atmosph. attenuation | 2.100 m | |
| and at 30 dB/km | 900 m | |
| Minimum line of sight at hop distance | 470 m at 800 m |
Quality of service (QOS)
| G.821/826 bit error rate | 10E-8 (unfaded) | |
| Delay per terminal | 8 µsec |
Transmitter
| Multi beam-technology | 4 x IR-LED | |
| Wavelength | 860 +/- 10 nm | |
| Outgoing power | 4 x 20 mW (eq +19 dBm) | |
| Aperture | 4 x 60 mm diameter | |
| Transmitting area | 113 cm² | |
| Divergence | 10 mrad | |
| Laserclass | 1M, eye-safe |
Receiver
| Diameter | 257 mm | |
| Receiving area | 520 cm² | |
| Acceptance angle | 5 mrad | |
| Typ | Si-PIN-TIA | |
| Sensitivity | +3 .. -45 dBm optical (BER 10E-6) | |
| Dynamic range | 48 dB optical | |
| Dry alarm contacts | yes |