Features: • ISDN U-transceiver with IOM-2 and optional microprocessor interface• Compatible to NT modes and TE mode of PEB 2091 IEC-Q V5.1• Perfectly suited for terminal and TA applications• U-interface (2B1Q) conform to ANSI T1.601, ETSI ETR 080 and CNET ST/LAA/ELR/DNP/822...
PSF21911: Features: • ISDN U-transceiver with IOM-2 and optional microprocessor interface• Compatible to NT modes and TE mode of PEB 2091 IEC-Q V5.1• Perfectly suited for terminal and TA app...
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Parameter |
Symbol |
Limit Values |
Units |
Supply voltage |
VDD |
0.3 < VDD < 7.0 |
V |
Input voltage |
VI |
0.3 < VI < VDD + 0.3 (max. 7) |
V |
Output voltage |
VO |
0.3 < VO < VDD + 0.3 (max 7) |
V |
Max. voltage applied at U-Interface |
VS |
0.3 < VS < VDD + 0.3 (max. 7) |
V |
Max. voltage between GNDA1 (GNDA2) and GNDD |
VS |
± 250 |
mV |
Storage temperature |
Tstg |
65 to 125 |
|
Ambient temperature PSB 21911 PSF 21911 |
TA TA |
0 to 70 40 to 85 |
|
Thermal resistance (system-air) (system-case) |
Rth SA Rth SC |
40 9 |
K/W K/W |
The PSF21911, IEC-Q TE Version 5.2, is a specific derivative of the PEB 2091, IEC-Q for terminal and small PBX applications. It features all necessary functions required for NTs and terminal applications like PC add-on cards and terminal adapters.
In stand-alone mode the PSF21911 IEC-Q TE Version 5.2 can be used fully pin compatible to IEC-Q V4.4 and former versions. In µP mode it offers a parallel or serial microprocessor interface.
The Processor PSF21911 Interface (PI) of the IEC-Q TE V 5.2 establishes the access of a microprocessor between U-interface and IOM-2. It's main function is illustrated in In µP mode B channels, D channel, C/I codes and Monitor commands can either be passed between the U-transceiver and IOM-2 directly, or they can be looped through the µP via the PI. Any selection of "passed" or "looped" channels can be programmed via a control register.
The PSF21911 µP-interface mode is enabled by setting the pin PMODE to "1". This pin was not to be connected in older versions of the IEC-Q. Its internal pull down resistor selects the stand-alone mode, if the pin is left open.
In stand-alone mode the IEC-Q TE PSF21911 is controlled exclusively via the IOM-2 interface and mode selection pins.