PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 279

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Initialization
For a correct start up of the Primary Access Interface a set of parameters specific to the
system and hardware environment must be programmed after RESET goes inactive.
Both the basic and the operational parameters must be programmed before the
activation procedure of the PCM line starts. Such procedures are specified in ITU-T and
DMI recommendations (e.g. Fault conditions and consequent actions). Setting optional
parameters primarily makes sense when basic operation via the PCM line is guaranteed.
Table 29 gives an overview of the most important parameters in terms of signals and
control bits which are to be programmed in one of the above steps. The sequence is
recommended but not mandatory. Accordingly, parameters for the basic and operational
set up, for example, may be programmed simultaneously. The bit FMR1.PMOD should
always be kept high.
Features like channel loop back, idle channel activation, clear channel activation,
extensions for signaling support, alarm simulation,
Transmission of alarms (e.g. AIS, remote alarm) and control of synchronization in
connection with consequent actions to remote end and internal system depend on the
activation procedure selected.
Table 29
Initialization Parameters
Basic Set Up
Mode Select
Specification of Line interface and clock
generation
Line interface coding
Loss of Signal detection/recovery
conditions
System clocking and data rate
channel translation mode
Transmit offset counters
Receive offset counters
AIS to system interface
Operational Set Up
Select framing
Framing additions
Synchronization mode
Signaling mode
Semiconductor Group
279
T1
FMR1.PMOD = 1
LIM0, LIM1, XPM2-0
FMR0.XC1/0, FMR0.RC1/0
PCD, PCR, LIM1, LIM2
SIC1.SSC1/0, SIC1.SSD1, FMR1.SSD0
CMR1.IRSP/IRSC/ IXSP/IXSC
FMR1.CTM
XC0.XCO, XC1.XTO
RC0.RCO, RC1.RTO
FMR2.DAIS/SAIS
T1
FMR4.FM1/0
FMR1.CRC, FMR0.SRAF
FMR4.AUTO, FMR4.SSC1/0,
FMR2.MCSP, FMR2.SSP
FMR5.EIBR, XC0.BRM, MODE, CCR1,
CCR2, RAH1/2, RAL1/2
Operational Description T1 / J1
may be activated later.
PEB 22554
09.98