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GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
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battery if local AC power fails. In addition, circuitry is incorporated in the MFB to disconnect the battery when
it is in deep discharge.
The MFB includes circuitry for Fax Tone Detection. By Admin-program, User use the MBU SLT Port 1 as
Fax port instead of Analog CO port.
Fax Tone Detection Circuit & Function is supported from the MFB Issue 2.
The MFB includes one External Relay for General purpose.
MFB can be installed on the SLOT6.
Wireless Terminal Interface Board (WTIB)
The WTIB provides two(2) base station interface circuits and two(2) DSP circuits.
Base station interface circuits are used to connect base stations which interface wireless terminals(GDC-330H, GDC-
335H, GDC-340H) based on DECT specifications.
The DSP circuits perform 8 channels of ADPCM conversion with integral echo canceling and echo suppression.
WTIB can be installed on the SLOT5.
CO Line Interface Board – Loop Start (LCOB2/LCOB/LCOBE/LCOBA/LCOB4)
There are Analog CO/PABX Line interface(Loop-start line interface) boards that is installed at the SLOT2 & SLOT3.
These boards has 2 CO/PABX Loop Start Lines and 4CO/PABX Loop Start Lines with ring and loop current detection,
A/D and D/A conversions, and pulse signaling.
S/T Interface Board (STIB2)
The S,T interface is based on the existing interface described in ETSI 300. 012 which is based upon ITU_T
Recommendations I.430 and provides modifications and further requirements.
This is applied at the S or T reference points for the basic interface structure defined in ITU_T I.412. Layer 1 interfacing
requires a balanced metallic transmission medium, for each direction of transmit capability to support 192Kbps(2B+D).
For interface circuits, one per transmission direction, are used for transmit digital signals. Data & bit clock are
transmitted by the NT master and extracted by TE slave. The GDK-20W system can be positioned at reference point Ia
or Ib on ETS 300. 012 that is TE-slave without power feeding or NT-master with power feeding. By selecting the short pin
and DIP switch on each line interface, the STIB can support either S0-interface (Line card function) or T-interface (Trunk
function).
The board line’s specific circuitry contains PEB2086 for Physical layer and data link layer.
This board is comprised of one T only port and one S/T Switchable port.
STIB2 can be installed on the SLOT2 and SLOT3.
S/T Interface Board (STIB)
The S,T interface is based on the existing interface described in ETSI 300. 012 which is based upon ITU_T
Recommendations I.430 and provides modifications and further requirements.
This is applied at the S or T reference points for the basic interface structure defined in ITU_T I.412. Layer 1 interfacing
requires a balanced metallic transmission medium, for each direction of transmit capability to support 192Kbps(2B+D).
For interface circuits, one per transmission direction, are used for transmit digital signals. Data & bit clock are
transmitted by the NT master and extracted by TE slave. The GDK-20W system can be positioned at reference point Ia
or Ib on ETS 300. 012 that is TE-slave without power feeding or NT-master with power feeding. By selecting the short pin
and DIP switch on each line interface, the STIB can support either S0-interface (Line card function) or T-interface (Trunk
function).
The board line’s specific circuitry contains PEB2086 for Physical layer and data link layer.
This board is comprised of one S/T Switchable port.
STIB can be installed on the SLOT2 and SLOT3.