FEATURES

• SPD-703-1, an Advanced Rate and Interface Converter, converts between the ITU G.703 codirectional (64 kbps) interface and several standard data communication interfaces.

• SPD-703-1 performs two types of conversion:
  • Interface conversion: from G.703 to V.24, V.35, V.36, X.21, RS-530 or Ethernet;
  • Rate conversion: from 56 or 48 to 64 kbps.

  This enables connecting of a variety of DTE equipment to G.703 transmission equipment.

• Operating full duplex at a data rate of 64 kbps, SPD-703-1 has a range of up to 800m (0.5 mile) from the G.703 equipment.

• The converter's receive timing is the recovered clock from the G.703 signal. The transmit timing source is strap-selectable for either:
  • Recovered clock from the G.703 receive signal;
  • Internal timing.

  Two internal 16-bit elastic buffers accommodate for the difference in clocking phase.

• SPD-703-1 acts as a rate adapter for connecting 48 or 56 kbps DTE equipment to a 64 kbps G.703 line. At 56 or 48 kbps, one control signal may be transferred end-to-end. Alternately, the available bandwidth can be used for a 1200 bps async secondary subchannel for connecting additional DTE equipment over the same link.

• SPD-703-1 features ITU V.54 diagnostics, enabling local analog loopback and local and remote digital loopback tests. The loops are manually activated either by front panel switches or from the DTE interface (except for X.21).In addition to the loops, a front panel PATT switch generates a pseudo-random test pattern (511 bits), according to the ITU V.52 standard for testing end-to-end error free connectivity.

• SPD-703-1 is available either as a standalone unit, or as a card for the ASM-MN-214 19" modem rack.

• Special hardware for mounting the standalone unit in a 19" rack can be ordered separately. This hardware enables the installation of either one unit or two units side-by-side.

SPECIFICATIONS 

• Conversion between G.703 codirectional interface and V.24, V.35, V.36 (RS-422), X.21, RS-530 interfaces, or a built-in Ethernet bridge
• Selectable data rates: 48, 56 or 64 kbps
• Selectable transmit timing source
• Line protection circuits
• Meets G.823 jitter requirements
• V.54 diagnostic (loops 2 and 3)
• Internal test pattern generator
• ITU V.110 compatible (conversion of 56 to 64 kbps)
• Second asynchronous subchannel up to 1.2 kbps

SPD-703-1/*/#
Standalone unit

SPD-703-1/R/#
Card version, for the ASM-MN-214 modem rack

ASM-MN-214/*/^
19" modem rack for 14 modem cards

CIA/&
Connector Interface Adapter
for the ASM-MN-214 19" rack

ORDERING

SPD-703-1/115/530
SPD-703-1/115/ETH
SPD-703-1/115/V24
SPD-703-1/115/V35
SPD-703-1/115/V36
SPD-703-1/115/X21
SPD-703-1/230/530
SPD-703-1/230/V24
SPD-703-1/230/V35
SPD-703-1/230/V36
SPD-703-1/230/X21
SPD-703-1/24/530
SPD-703-1/48/530
SPD-703-1/48/ETH
SPD-703-1/48/V24
SPD-703-1/48/V35
SPD-703-1/48/V36
SPD-703-1/R/530
SPD-703-1/R/V24
SPD-703-1/R/V35
SPD-703-1/R/V36

APPLICATIONS