psf21911 ETC-unknow, psf21911 Datasheet - Page 66

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Semiconductor Group
SSP
TIM
Pins
Pin-Res Pin-Reset
Pin-SSP Pin-Send Single Pulses
Pin-DT
U-Interface Events
The signals SLx and TL received on the U-interface are defined in table 22 on page 100
ACT
Send Single Pulses
Unconditional command which requests the transmission of single pulses on
the U-interface. The pulses are issued at 1.5 ms intervals and have a duration
of 12.5 s.
The chip is in the “Test” state, the receiver will not be reset.
Timing
In the NT-mode the U-transceiver is requested to continue providing timing
signals and not to leave the “Power-up” state.
Corresponds to a low-level at pin RES or a power-on reset. The function of this
pin is the same as of the C/I-code RES. C/I-message DR will be issued. The
duration of the reset pulse must be longer than 10 ns.
Corresponds to a high-level at pin TSP in stand-alone mode. The function of
this pin is the same as of the C/I-code SSP. C/I-message DR will be issued.
The high-level must be applied continuously for single pulses.
Pin-Data Through
This function is activated when both pins RES and TSP are active in stand-
alone mode (RES = ’0’ and TSP = ’1’). The function of this pin is the same as
of the C/I-code DT. C/I-message DR will be issued.
ACT-bit received from LT-side.
– ACT = 1 requests the U-transceiver to transmit transparently in both
– ACT = 0 indicates that the LT-side has lost transparency.
directions. As transparency in receive direction (U-interface to IOM) is
already performed when the receiver is synchronized, the receipt of
ACT = 1 establishes transparency in transmit direction (IOM to U-
interface), too. In the case of loop-backs, however, transparency in both
directions of transmission is established when the receiver is
synchronized.
66
U-Transceiver
PSB 21911
PSF 21911
11.97