psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 66

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
2.2.7
D-channel access control was defined to guarantee all connected HDLC controllers a fair
chance to transmit data in the D-channel. Collisions are possible on the IOM-2 interface,
if there is more than one HDLC controller connected. This arbitration mechanism is
implemented in the SCOUT and will be described in the following chapter.
2.2.7.1
The TIC bus is implemented to organize the access to the layer-1 functions provided in
the SCOUT (C/I-channel) and to the D-channel from up to 7 external communication
controllers (see figure 32).
To this effect the outputs of the controllers (ICC:ISDN Communication Controller PEB
2070) are wired-or and connected to pin DU. The inputs of the ICCs are connected to
pin DD. External pull-up resistors on DU/DD are required. The arbitration mechanism
must be activated by setting MODEH.DIM2-0=00x.
Figure 32
Applications of TIC Bus in IOM-2 Bus Configuration
D-channel
Telemetry/
Packet
Communication
B-channel
Voice/Data
Communication
with D-channel
Signaling
B-channel
Voice/Data
Communication
with D-channel
Signaling
D-Channel Access Control
TIC Bus D-Channel Access Control
µC-Interface
TIC Bus
D-channel
Access Control
ICC(7)
ICC(1)
IOM-2 Interface
SCOUT-P(X)
56
U
PN
-Transceiver
U
PN
-Interface
PSB 21391
PSB 21393
TIC_ARBI-UPN.vsd
Interfaces
2001-03-07