G.SHDSL Four-Wire Ethernet Network Extender Kit
2. Overview
2.1 Introduction
The LR0202A-KIT, a G.SHDSL (Single-pair High-bit-rate Digital Subscriber Line) Ethernet Network Extender, provides broadband full-duplex transmission with bandwidth aggregation up to 10.8 Mbps over two pairs of copper line for point-to-point LAN con- nectivity between two Ethernet networks. This is enough speed to support VoIP, Web hosting, and teleconferencing. The kit includes two extenders. The LR0202A-KIT can be configured into either STU-C for the central (master) side or STU-R for the remote (slave) side. The LR0202A-KIT conforms to the ITU-T Rec. G.991.2, to meet G.shdsl.bis network requirements. It offers a cost-effective symmetrical broadband solution for bandwidth-hungry applications such as LAN-to-LAN connectivity, Internet access, and VoIP applications over two twisted pairs.
Over one pair of 26 AWG (0.5 mm) copper twisted-pair wire, the LR0202A-KIT sends data up to 12,000 feet (2.3 miles, about 3.7 km) at 2.304 Mbps and 4500 feet (about 0.8 miles, 1.3 km) at the maximum rate of 10.8 Mbps. It can also reach 5500 feet (1 mile, 1.6 km) at 9.216 Mbps over two pairs of 26 AWG (0.5 mm) copper twisted-pair wire, and go 22,500 feet (about 6.8 km) at 192 kbps. With its rate-adaptive features, the LR0202A-KIT may provide even longer transmission distances. Users can also select a fixed data rate for the copper line ranging from 64 kbps to 5.696 Mbps over one pair or 128 kbps to 10.8 Mbps over two pairs. The LR0202A-KIT provides a console port for the user to configure the settings and to monitor the connection status.
Table 2-1 lists the extenders’ low-speed and maximum-speed fixed data rates and adaptive data rates.
| Table 2-1. Fixed and adaptive data rates. |
Fixed Data Rate | | Adaptive Data Rate |
Low Speed | Maximum Speed | Low Speed | Maximum Speed |
64 kbps, 1-pair | 5.696 Mbps, 1-pair | 192 kbps, 1-pair | 4.608 Mbps, 1-pair |
128 kbps, 2-pair | 10.8 Mbps, 2-pair | 384 kbps, 2-pair | 9.216 Mbps, 2-pair |
2.2 Features
•Complies with ITU-T Rec. G.991.2 G.shdsl.bis standard
•SHDSL trellis-coded pulse amplitude modulation (TCPAM) line code
•Fixed data-rate selection from 10.8 Mbps to 128 kbps for 2-pair SHDSL lines
•Adaptive data rate from 4.608 Mbps to 192 kbps for 1-pair SHDSL mode
•Adaptive data rate from 9.216 Mbps to 384 kbps for 2-pair SHDSL mode
•Maximum transmission distance: 22,500 ft. over 26 AWG twisted pair
•Noise margin
•1 dB is guaranteed for fixed rate and adaptive rate modes
•STU-R (remote) follows STU-C's (central office) speed for 192 kbps to 2.304 Mbps in 1-pair fixed rate mode
•STU-R follows STU-C's speed for 384 kbps to 4.608 Mbps in 2-pair fixed rate mode
•RJ-48 connector for SHDSL line connection
•Two RJ-45 connectors for 10BASE-T/100BASE-TX Ethernet switch ports are autosensing and autonegotiating
•Ethernet Auto MDI/MDI-X for auto Tx/Rx swap so you don’t need a crossover cable
•Console port for network management configuration
•(8) LED status indicators
