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GDK-100
DIGITAL KEY TELEPHONE SYSTEM
27
The maximum 6 BRIBs can be installed in a system, but total CO lines including analog CO of the
system should not be more than 48 lines.
QSIG function can be supported through BRIB (software version 99A), and SMEMU MUST be
used for this function.
2.4.11.3 ISDN STIB (Basic Rate Interface Board: switchable S/T interface)
The S or T interfaces are based on the existing interface described in ETSI 300. 012, which is based on
ITU_T Recommendations I.430 and provides modification 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 of the interface requires a balanced metallic transmission medium, for each direction of
transmission capable of supporting 192Kbps(2B+D). For interface circuits, one per transmission direction,
are used for the transmission of digital signals. Data & bit clock are transmitted by the NT master and
extracted by TE slave. GDK system can be positioned at reference point Ia (T) or Ib (S) on ETS 300 012
that is TE-slave without power feeding or NT-master with power feeding. By selecting the jumper position
on each line interface, STIB supports S-interface (Line card function)or T-interface (Trunk function).
SCC1 of MC68302 will serve the 64Kbps Monitor channel access which is use to convey message
oriented local function such as software programming or S/Q channel information or access to internal
register of line interface devices. SCC2 of CPU is assigned as 512Kbps HDLC communication to main
processor on MPB. SCC3 of CPU is assigned as 38400bps RS232C channel. This RS232 channel will be
used only in development stage for software and hardware debugging.
For physical layer interface function, SIEMENS’s PEB2084, Quadruple Transceiver for S/T interface
which is implements four wire S/T interface used to link voice/data digital transmission to ISDN BRI is
applied. It can handle up to 4 S/T interfaces simultaneously according to ITU-T I.430, ETSI 300.012, and
ANSI T1.605 standards.
For data link layer interface function, SIEMENS’s PEB2075 ISDN D-channel exchange controller which
is a serial HDLC data communication circuit with four independent channels is used. Each channel is fully
independent and programmable by its own register set.
For power feeding control, PEB2025(Power feeding device from SIEMENS) is occupied. It can handle
up to 4-channel with current limiting and short circuit protection.
STIB should be installed in any slot of slot No. 1-7.
A PLLU MUST be installed for proper operation.
The maximum 7 STIB boards can be installed in a system, but total CO lines including analog CO
should not be more than 48 lines(channels), neither total extensions except WTIB should be more
than 72 port(channels). .
QSIG function can be supported through STIB T-interface only (software version 99A), and
SMEMU MUST be used for this function.
Содержание GDK-100
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