DDA-4301 E3/DS3 G.703 Data Distribution Amplifier, available from, IRT Electronics, operates in accordance with the G.703 specification. Either E3 (34.368 Mb/s) or DS3 (44.736 Mb/s unframed or 44.210 Mb/s framed) data rates are possible by an on board switch selector.
DDA-4301 E3/DS3 G.703 Data Distribution Amplifier incorporates a protection facility for switching to signals from a standby module when a fault is detected.
Three outputs are provided at the rear of the module of the DDA-4301 E3/DS3 G.703 Data Distribution Amplifier with an additional output for monitoring purposes on the front panel.
The primary output is controlled by relays to provide a bypass signal from the input during a power failure.
On board switch setting in the DDA-4301 E3/DS3 G.703 Data Distribution Amplifier allows an Alarm Indication Signal (AIS) detected in the data stream to generate a changeover request for a companion unit.
On loss of the input, the output of the DDA-4301 E3/DS3 G.703 Data Distribution Amplifier can be set to give either no signal or an AIS signal output.
Indicators are provided on the front panel for: DC power, data loss, AIS detect, module in service and module in standby.
External alarm signals are also available on the rear of the module of the DDA-4301 E3/DS3 G.703 Data Distribution Amplifier.
Changeover-inhibit and changeover-request switches are provided on the front panel for use where modules are linked in pairs for redundancy.
For this configuration, a special double width rear assembly (type ZDA-4300RH) is available to link the signal and logic sections of two modules.
Monitoring via a simple network management protocol (SNMP) is optionally possible when fitted with a plug-in SNMP board and run in an IRT 4000 series frame fitted with SNMP capability.
- G.703 compliant
- For either E3 or DS3 G.703 data rates
- Adaptive cable input equalisation
- Data regeneration
- Front panel monitoring facility
- Protection switching facility
- External alarms and bypass
- Redundant pair operation capability
- Optional SNMP capability