This new mains powered 1U subrack contains 2 completely independent G722/G711 Codecs and a twin Terminal Adapter.
A front panel keypad makes for easy dialling and set up of the codecs.
The terminal adapter is suitable for use on all ISDN networks and only requires an interface (the standard ISDN interface found throughout Europe).
Monitoring of the ISDN call is done via front panel LEDs and also an onboard loudspeaker. Relay loop closures are also made available via a rear panel connector for external indication of the 2 codecs framing status.
Audio inputs and outputs for the 2 Codecs are zero level balanced on rear panel XLRs.
The G722 codecs provide 7.5kHz of audio bandwidth and to ensure reliability and compatibility with other codecs statistical analyses is used for the frame alignment.
The G711 coding algorithm connects an ISDN line to a plain old telephone system (POTS), therefore this versatile subrack can be used instead of an old telephone balance unit, with the added advantage of 100% separation between the go and return circuits.