psf2115 ETC-unknow, psf2115 Datasheet - Page 57

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

collision resolution according to ITU I.430.
In this case the IPAC continuously compares the D data bits with the received E-echo
bits. Depending on the priority class selected (8 or 10), the S/G bit is controlled in a way
that data transmission by the internal D-channel controller or by an externally connected
ICC will start after the appropriate number of E-bits set to ’1’ are detected by the layer 1
transceiver.
The priority class (priority 8 or priority 10) is selected by transferring the appropriate
activation command via the Command/Indication (C/I) channel of the IOM-2 interface to
the IPAC S-interface. If the activation is initiated by a TE, the priority class is selected
implicitly by the choice of the activation command. If the S-interface is activated from the
NT, an activation command selecting the desired priority class should be programmed
at the TE on reception of the activation indication (AI8). In the activated state the priority
class may be changed whenever required by simply programming the desired activation
request command (AR8 or AR10).
level of priority has been detected, the TE may start transmission of an HDLC frame. If
a collision occurs, the TE immediately shall cease transmission, return to the D-channel
monitoring state, and send 1s over the D-channel.
2.3.4.3
If the IPAC is not in a point-to-point configuration in TE mode, D-channel collision on the
S-bus can occur. For this purpose the characteristic of the D-channel Mode register must
be programmed to DIM2-0 = 001 or 011 (refer to table 27 of chapter 4.3.7) for D-channel
Semiconductor Group
S-Bus D-channel Control in TEs
57
Functional Description
PSB 2115
PSF 2115
11.97