Pasolink Neo

To provide reliable digital access links and fully exploit the potential of end-to-end advanced networks, NEC has developed the PASOLINK NEO, a narrow band point-to-point digital microwave relay system.

This system meets an increasing demand for digital transmission services, and will satisfy the needs for common carrier access links, private links, urban area networks, rural area networks, temporary networks or emergency links for data and transmissions.

The PASOLINK equipment offers very high performance with large system flexibility, which is easy to install and is a field proven to be very reliable. The PASOLINK NEO system provides interface types of PDH, SDH and LAN. The transmission signals are 5 to 48 x E1, 1 to 2 x E3, 1 to 2 x STM-1, 2/4 x 10/100 Base-T(X) and GbE signals.

Features:

• Consisting of compact ODU (Outdoor Unit), IDU (Indoor Unit) and Antenna
• Capacitiy: from 5x2Mbps up to 1 or 2x155 Mbps
• System configuration variation (1+0, 1+1 (HS), 1+1 (HS/SD), 1+1 (FD), 2+0 co-channel)
• 1U high 1+1 system
• Supported modulations: QPSK, 16QAM, 32QAM, 128QAM (with identical modem)
• High system gain and high spectrum efficiency
• Automatic TX power control (ATPC)
• Remote supervisory and control of network using a personal computer
• Easy, simple and quick installation
• PDH interfaces:
  • 16E1+2PLAN (up to 80Mbps)
  • 32E1+2PLAN (coming soon, up to 100Mbps)
  • 48E1
  • 2E3+E1WS+LANWS (up to 80Mbps)
  • 4PLAN (up to 100Mbps)
  • 16E1+2PLAN DXC (digital crossconnect)
• SDH interfaces:
  • STM-1 electrical
  • STM-1 optical (APS is available)
  • Gigabit Ethernet (both optical&electrical on same card)
• flexible upgrade with software key

Adaptive modulation radio (AMR)

AMR is a technology to improve robustness mainly in the packet transmission environment by utilizing thermal threshold difference between modulation hierarchy, such as QPSK 256 QAM etc. For instance, intensive rain causing receiving level attenuation at high frequency bands, AMR keeps the link availability by automatically and error-free selection of the lower thermal threshold modulation. For example, QPSK threshold is 6 dB lower than 16 QAM but transmission capacity becomes half.

In the IP packet transmission, i.e., no hierarchy transmission case, link connectivity in other word, robustness might be more important factor even though transmission capacity is significantly reduced. However, in the hybrid transmission, it is recommended to keep the same transmission capacity for TDM transmissions including PWE or CESoP even at degraded receiving conditions. Prioritization between TDM and Ethernet packets or prioritization between Ethernet ports or VPN-base is the quite important matter to maintain the quality of the highest priority service.

Since severe rain attenuation is rapidly fluctuated, it is required to sufficiently correspond to such high descent and ascent speeds of receiving signal level. Adoption of small stepping method such as utilizing both forward error correction code ratio difference and modulation may not always catch up to these speeds and may not effectively work in real world.

Based on NEC's vast experience on microwave to millimeter wave propagation, the most realistic reliable AMR functionality from the device level was developed and equipped in iPASOLINK family platforms retaining the QoS parameter setting capability on AMR operation.