True North Controls

The Aprisa SRi was distance-engineered and optimized for SCADA and telemetry applications, providing reliable, robust performance however demanding the conditions: what we call ‘real world radio’. RF performance is unbeatable, with attention paid to every element of the design: transmitter, receiver, modulation, and efficiency. The receiver maintains exceptional low noise operation via excellent sensitivity for greater distance and high selectivity and intermodulation suppression for superior protection from interference. This performance is complemented by fast switching circuitry and high transmit power ensuring long-distance operation with exceptional system reliability and availability.

KEY FEATURES

Secure: with its defense-in-depth approach including AES encryption, authentication, address filtering, and user access control, the Aprisa SRi protects against malicious attacks and consumer-grade wireless vulnerabilities.
Flexible hopping channel and zone arrangements: full band and reduced non-overlapping zone options allow a tailored approach to interference mitigation. The unique combination of advanced forward error correction (FEC) with packet synchronized selective ARQ combats interference. Time-sliced fast hop and advanced access control MAC delivers more usable throughput and reduced latency.
Future-proof: the Aprisa SRi supports dual serial and dual Ethernet ports in a single, compact form factor, designed to cryptographically secure legacy serial, protect existing device investment, and enable new applications. Old and new application protocols can be run side by side.
Aprisa SR family: the Aprisa SRi is fully integrated with the Aprisa SR family and includes all family features including networking, management, and security. Maximize your experience with reduced training and time to value.
Advanced L2 / L3 capabilities: selectable L2 bridge, L3 router, or advanced gateway router combination L2/L3 modes with VLAN, QoS, NAT, and filtering attributes to maximize capacity in constrained bandwidth and prioritize mission-critical traffic while meeting tough security and IP network policy imperatives.
Link efficiency: Adaptive Coding and Modulation (ACM) and forward error correction maintain the integrity of the wireless connection while an effective channel access scheme and advanced IP routing features ensure efficient transfer of data across the Aprisa SRi network.
Reliable and robust: the Aprisa SRi requires no manual component tuning and maintains its performance over a wide temperature range using full specification industrially rated components and shared Aprisa family heritage.
Easily managed: an easy to use GUI supports local element management via HTTPS and remote element management over the air, and SNMP support allows network-wide monitoring and control via a third-party network management system.

Aprisa SRi Details

FFCC / IC 902-928 MHz band
RS-232 and IEEE 802.3 protocols
Software selectable frequency hop sets with black list capability
Gross data rates up to 240 kbit/s
Half-duplex operation
256, 192, or 128 bit AES encryption
Adaptive Coding and Modulation: QPSK to 256 QAM
AES-CCM to NIST SP 800-38C
1W peak output power
Advanced FEC, packet synchronized selective ARQ
Dedicated alarm port
Layer 2 bridge (VLAN aware), layer 3 Router, and advanced gateway router combination L2/L3 modes
VLAN tagging and Q-in-Q
Flexible QoS priority enforcement – by port or traffic type, VLAN, PCP/DSCP, rule including SMAC/DMAC, IP address and IP protocol, and EtherType
L2 / L3 / L4 filtering
Substation hardened to IEEE 1613 class 2 and IEC 61850-3
30 kV ESD antenna protection
Class 1, Division 2 for hazardous protection
–40 to +70 °C operational temperature without fans

Aprisa SRi Applications

Electricity grid: distribution automation DA/DFA/DR and Volt/VAR cap banks
Smart grid: concentrator communications and GPRS replacement
Renewables: distributed energy DER/DERM for solar and wind farms
Water and wastewater: flow, level, and pressure modulation
Oil & Gas: wellhead automation, production metering, lift pump automation

PRODUCT SPECIFICATIONS

Aprisa SRi short-form specification

Topology

Point-to-Multipoint (PMP) operation

Operating mode

Base Station or Remote Station, Single Radio Store & Forward Repeater

915 MHz Industrial License Free Spread Spectrum

FCC / IC; 902-928 MHz

Channel size

50KHz & 100KHz

Gross data rates

256 QAM

320 kbit/s in 50 kHz
576 kbit/s in 100 kHz

64 QAM
240 kbit/s in 50 kHz
432 kbit/s in 100 kHz

16 QAM
160 kbit/s in 50 kHz
288 kbit/s in 100 kHz

QPSK
80 kbit/s in 50 kHz

144 kbit/s in 100 kHz

Channels per-hop zone

50 in 50 kHz mode, 25 in 100 kHz mode

Full Band Operation

400 channels in 50 kHz mode

200 channels in 100 kHz mode

RF operation

Half-duplex RF operation

Data interface ports

Ethernet - 2 ports RJ45 10/100Base-T switch
Serial - 2 ports RJ45 RS-232 (Additional RS-232 port via USB converter)

Transmit average output power

0.01 – 0.4 W

Compression

Ethernet header and IP/TCP/UDP ROHC header compression
Ethernet and serial payload compression to increase the narrowband radio capacity

Protocols

Ethernet - IEEE 802.3 IEEE 802.3, 802.1d/q/p with L2 Bridge or L3 Router modes
Serial - Legacy RS-232 transport