psf2115 ETC-unknow, psf2115 Datasheet - Page 68

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

Semiconductor Group
2.4
2.4.1
The S-transceiver supports terminal mode (TE), line termination subscriber side mode
(LT-S) and line termination trunk side mode (LT-T). The selection is performed by two
mode pins (see table 4), additionally the B-channel receive and transmit data paths are
switched to DU or DD line depending on the mode (figure 21). In other words, the DU
line always carries data which is transferred from the subscriber to the central office and
the DD line carries data which comes from the central office to the subscriber. Therefore
the direction of DU and DD is mode dependent:
• DU is input, DD is output (TE and LT-T)
• DU is output, DD is input (LT-S)
In LT-S and LT-T mode the EAW pin is used as the second mode pin.
Table 4
TE-mode
LT-T mode
LT-S mode
Figure 21
S/T Interface
Operating Modes
Mode Setting
Data Path Switching
MODE0
0
1
1
1
0
MODE1/
EAW
EAW
68
Transmit-data
on S
DU on IOM
DU on IOM
DD on IOM
Functional Description
DD on IOM
DD on IOM
DU on IOM
Receive-data
on S
PSB 2115
PSF 2115
11.97