Ltu-2

Transcript

LTU-2 E1 Line Termination Unit • FEATURES • Extended dynamic range DESCRIPTION • of up to 2.2 km to the nearest repeater • Supports up to -45 dB at 1024 kbps • Simplex line power feed for E1 repeaters • Complies with ITU G.703 • • V.54 diagnostics • V.52 test pattern generator and ERR LED indication • Front panel jack access • Line protection circuit • Surge protection complies with ITU K.17 • Standalone and rack module version • AC or DC powered • The LTU-2 Line Termination Unit connects local equipment such as PABXs and E1 multiplexers to the E1 public network, with complete network protection. In addition, LTU-2 provides line power feed for E1 repeaters such as RPT-0. When coupled with 14 repeaters, LTU-2 extends an E1 line up to 20 km (12.5 miles). LTU-2 meets all the requirements of ITU G.703 and is compatible with almost all PTT provided E1 services. Surge and line protection circuitry complies with ITU Recommendation K.17. LTU-2 supports up to 45 dB of attenuation at 1024 kbps (half the E1 bit rate). For a 22 AWG cable this represents a maximum distance of 2.2 km to the nearest repeater. • • • Two constant-current built-in DC power supplies of -48 VDC and -72 VDC (strap-selectable) are available for the repeater DC feed. The power feed features current limit protection with simplex line power on the same E1 line. -48 VDC power feed supports up to four RPT-0 units; -72 VDC power feed supports up to seven units. Diagnostic capabilities comply with ITU V.54 and include local analog loopback and remote digital loopback, activated via a front panel switch. The PATT switch activates an internal 511-bit pseudo-random test pattern for complete end-to-end integrity testing. The ERR LED indicates each bit error detected. Front panel jacks allow easy network access for more extensive testing using external test equipment. LTU-2 is available as a desktop unit or as a card for installation in the LTU-MN-114 19" card cage (see Ordering). LTU-MN114 can accommodate up to 14 cards. An optional rack-mount adapter kit enables installation of one or two standalone units in a 19" rack. LTU-2 E1 Line Termination Unit SPECIFICATIONS • • • Network Interface Data rate: 2.048 Mbps Line code: Bipolar, HDB3 Impedance: Balanced: 120Ω Unbalanced: 75Ω Signal level: Receive: 0 to -45 dBm Transmit: Balanced: ±3V ±10% Unbalanced:±2.37V ±10% Connector: Balanced: 15-pin D-type, male Unbalanced: Two BNC coaxial Surge protection: Per ITU K.17 DTE Interface Data rate: 2.048 Mbps ±50 ppm Bipolar, HDB3 Line code: Impedance: Balanced: 120Ω Unbalanced: 75Ω Signal level: Receive: 0 to -10 dBm Transmit: Balanced: ±3V ±10% Unbalanced:±2.37V ±10% Connector: Balanced: 15-pin D-type, female Unbalanced: Two BNC coaxial Jitter Performance Transparent between the network and the DTE side APPLICATION • • • • • Diagnostics ITU V.54 loopbacks, activated via front panel switches REM: Remote digital loopback ANA: Local analog loopback on network side ITU V.52 test pattern PATT: 511 bit pseudo random test pattern with Error LED indication Bantam jacks (front panel): EQ-IN, EQ-OUT, NET-IN, NET-OUT Alarm Response Loss of signal on DTE with network response as AIS, or Loss of signal on network with DTE response as AIS (strap-selectable) Indicators PWR Power TEST Test ERR Bit Error for PATT test DTE-LOS DTE loss of signal NET-LOS Network loss of signal NET-AIS Network AIS -3 NET-10 Bipolar violation error check Power Supply 115/230 VAC (±10%) 47 to 63 Hz, 13 VA; -48 VDC (±10%) input • • Physical LTU-2SA: Height: Width: Depth: Weight: LTU-2R: Dimensions: 114 Weight: 44 mm / 1.7 in 193 mm / 8.0 in 240 mm / 7.6 in 1.4 kg / 3.1 lb fit the LTU-MNcard cage 3.6 kg / 10.1lb Environment Temperature: 0-50οC / 32122oF Humidity: Up to 90%, non-condensing ORDERING LTU-2SA/* E1 Line Termination Unit, standalone with internal power supply LTU-2R E1 Line Termination Unit, card for the LTU-MN-114 card cage * Specify power supply: 115 for 115 VAC operation 230 for 230 VAC operation 48 for -48 VDC operation RM-9 Hardware for mounting one or two units in a 19" rack. DC Feed -48 VDC with 50, 100, 150 mA constant current source, for simplex line power feeding of up to four RPT-0 units with 19 AWG cable (strap-selectable) -72 VDC for support of up to seven RPT-0 units with 19 AWG cable. Available with 115/230 VAC option 629-100-03/98  1998 RAD Data Communications Ltd. Specifications are subject to change without prior notice.