psf2115 ETC-unknow, psf2115 Datasheet - Page 82

• Manufacturer Part Number: psf2115
• Description: Isdn Adapter Circuit Ipac
• Manufacturer: ETC-unknow

PSB 2115
PSF 2115
Functional Description
2.5.1
Analog Functions
For both receive and transmit direction, a 2:1 transformer is used to connect the ISAC-
S transceiver to the 4 wire S/T interface (CONF:AMP=0). As an option, the receiver can
also be operated with a 1:1 transformer (CONF:AMP=1). The connections are shown in
figure 25.
Figure 25
Connection of the Line Transformers and Power Supply to the IPAC
The external transformers are needed in both receive and transmit direction to provide
for isolation and transform voltage levels according to CCITT recommendations.
The equivalent circuits of the integrated receiver and transmitter are shown in figure 26.
The full-bauded pseudo-ternary pulse shaping is achieved with the integrated transmitter
which is realized as a current limited voltage source.
Semiconductor Group
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11.97