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RAD ( MTM )
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 | The RAD MTM-26 Medium range voice band modem for metropolitan
applications
| Operates over conditioned or unconditioned lines
| V.24/RS-232, Sync/Async digital interface
| Selectable data rates up to 19.2 kbps
| Full duplex transmission over 4-wire cables
| Range of 19 km (12 miles) at 19.2 kbps
| V.54 diagnostic loops
| Internal V.52 test pattern generator and error LED
| Real-time, line performance monitoring
| QAM and Trellis-coded modulation
| Card version for the ASM - MN-214 19" modem rack | |
| Extended range over 4-wire cable
| Selectable data rates of 32 or 64 kbps
| Range over unconditioned 24 AWG lines up to 14 km / 9.3 miles at 64
kbps
| Enhanced reliability and performance
| Extends range of access points to digital networks
| Supports digital interfaces: | V.24/RS-232, V.35, X.21, V.36/RS-449, RS-530, 64 kbps G.703 Codirectional and a built-in Ethernet bridge Adaptive equalizer and QAM modulation
| Internal V.52 pattern generator and V.54 loop diagnostics
| Online signal quality diagnostics
| Card version for the ASM - MN-214 19" modem rack. | |
| MTM-20 is an extended range, 4-wire modem operating at data rates of 32 or 64 kbps. It is optimized for metropolitan applications where the distances are too long or the operating conditions too poor for standard short-range modems. |
| The MTM-20 sync modem provides full duplex data transfer over
unconditioned, 4-wire leased lines. It uses an adaptive equalizer and
QAM modulation to achieve reliable performance, even over poor quality
lines. At 64 kbps, over 24 AWG unconditioned lines, MTM-20 has a range
of 14 km (9.3 miles) and over 19 AWG lines a range of up to 32 km (20 miles). |
| MTM-20 supports a wide range of digital interfaces: - V.24/RS-232 - V.35 - V.36/RS-449 - RS-530 - G.703 codirectional (64 kbps) - X.21 and a built-in Ethernet bridge. |
| Transmit timing is provided internally or recovered from the receive signal. Alternatively, the transmit timing can be derived externally from the digital interface, enabling tail-end applications. Receive timing is generated from the receive signal. The transmit level is selectable in 3 dB increments, over the range of 0 to -12 dBm. |
| MTM-20 features V.54 diagnostics for performing local analog loopback and local and remote digital loopbacks. The loopbacks can be activated either from the front panel or by control signals via the digital interface. |
| MTM-20 can perform a Bit Error Test on the link, using an internal pseudo-random test pattern. A front panel signal quality (SQ) LED flashes when a bit error is detected. In addition, line quality is tested online, without interruption or interference to data transmission. |
| MTM-20 is available as a standalone unit or as a rack-mount card for the ASM - MN-214 19" modem rack. Special hardware is available for mounting one or two standalone units in a 19" rack (see Ordering). |
| Extends range of data transmission over 4-wire lines
| Selectable data rates: 32, 64 and 128 kbps
| QAM technology for extended range and improved performance
| Variety of digital interfaces: | - V.24 - V.35 - X.21 - RS-530 - V.36/RS-449 - Ethernet (built-in bridge) - G.703 codirectional (64 kbps) Automatic rate detection in external clock mode for tail-end
applications
| Configuration and monitoring of local and remote units from the front
panel
| Card versions available for the ASM - MN-214 19" modem rack and
LRS - 12 19" modem rack with central SNMP management | |
| MTMi-20 is a synchronous short-range modem, operating in full duplex over 4-wire lines. Data rates are user-selectable between 32 kbps and 128 kbps. |
| The modem employs QAM technology to extend the transmission range (see Table 1) and provide efficient transmission, even over poor quality lines. |
| The modem uses an out-of-band management channel for controlling and monitoring the remote unit. Both data and management are transmitted over the same wires, simultaneously. |
| Menu-driven software, activated from the front panel, allows the user
soft-select monitoring and adjusting of local and remote units. The following parameters can be monitored and controlled: - Baud rate (when set to Internal or Receive mode) - Clock source - Output transmit level - Loop activation - Internal BER tester activation - LED status of local and remote units - Setting both local and remote units to default settings - Real-time monitoring of link status - Real-time alerts of fault conditions - Real-time signal quality monitoring. |
| The transmit clock can be derived from three different selectable
sources: - Internally, from a built-in oscillator - Recovered from the received signal - From the digital interface (for tail-end applications). |
| When set to external mode, MTMi-20 automatically detects the clock rate coming from the digital interface and sets the remote unit to the same rate. When the digital interface rate is changed, both local and remote units follow the new rate and synchronize accordingly. |
| MTMi-20 supports a wide range of digital interfaces: V.24/RS-232, V.35, X.21, RS-530, V.36/RS-449 and G.703 codirectional (64 kbps). In addition, an Ethernet/802.3 bridging option enables direct connection of an Ethernet LAN to both sides of the modems link. |
| The MTMi-20 system configuration is stored in non-volatile memory, minimizing the system downtime after power is down or when a faulty remote unit is being replaced. |
| The out-of-band management channel provides real-time alerts for: - Disconnection of the digital data transmission - Disconnection of the management channel - Remote modem failure - Loop activation. |
| Real-time indication of system status is provided on the front panel LCD for the local and remote modems. |
| MTMi-20 is available as a standalone unit in both MTMi-20/M "Master" and MTMi-20/S "Slave" versions. The master version has a front panel LCD and control switches. The slave unit has a blank panel, which prevents unauthorized changes of link parameters. MTMi-20 is also available as a card for central solutions: - MTMi-20/R - card for the ASM - MN-214 19" modem rack - MTMi-20C - card for the LRS - 12 19" modem rack with central SNMP management. |
| Management of the local and remote modems for MTMi-20/S and MTMi-20/R versions is carried out via a standalone Portable Control Unit (PCU) through a special 20-pin connector on the modem front panel. The PCU is ordered separately (see Ordering). |
| The MTMi-20C card for the LRS - 12 rack can be managed from an ASCII terminal or from an SNMP UNIX station connected to the rack. RADview, an SNMP application, is available for managing the MTMi-20C cards and other RAD products. RADview enables management of a large number of links, system infrastructure, and presentation of statistical information on link availability. It is a user-friendly system, utilizing a graphical presentation of all network elements. |
| Diagnostic features include activation of ITU V.54 loops and an
internal BER tester. The loops available are: - Local analog loopback - Local digital loopback - Remote analog loopback. - Remote digital loopback The loops can be activated from the front panel, PCU (Portable Control Unit) or from the digital interfaces that support loop activation signals. Table 1. MTMi-20 Maximum Transmission Ranges |
| Data Rate | 19 AWG | 22 AWG | 24 AWG | 26 AWG | ||||
| (kbps) | km | miles | km | miles | km | miles | km | miles |
| 32 | 36 | 23 | 24 | 15 | 18 | 11 | 13.5 | 8.5 |
| 64 | 28 | 18 | 17.5 | 11 | 14 | 8.5 | 10.5 | 6.5 |
| 128 | 22 | 14 | 14 | 8.5 | 10 | 6 | 7.5 | 4.5 |
