PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 73

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

The IOM
DIN, DOUT
DCL
FSC
Figure 26
3.6.1.3
Note 13: This timing applies to the TE and the COT-1536 modes.
In the terminal timing mode the IEC-Q provides a data clock DCL with a frequency of
1536 kHz. As a consequence the IOM
nominal data rate of 256 kbit/s.
• Channel 0 contains 144 kbit/s (for 2B+D) plus Monitor and Command/Indication
• Channel 1 contains two 64-kbit/s intercommunication channels plus Monitor and
• Channel 2 is used for IOM
Note 14: Channels 1 and 2 can be used only in the TE mode. The description
Note 15: Channel 0 is called the ’active channel’ of the IEC-Q. Channels 1 and 2 are
The IOM
DIN, DOUT
DCL
FSC
Semiconductor Group
FSC
DD
DU
channels for the layer-1 device.
Command/Indication channels for other IOM
Command/Indication bits are used in channel 2.
®
®
-2 signals are:
-2 signals are:
above for these two channels doesn’t apply to the COT-1536 mode.
called the ’passive channels’ of the IEC-Q.
Terminal Timing Mode
B1
B1
Plain Frame Structure of the IOM
256 kbit/s
512 kHz
8 kHz
768 kbit/s
1536 kHz output
8 kHz output
®
B2
B2
-2 bus arbitration (access to the TIC bus). Only the
IOM Channel 0
®
-2 interface provides three channels each with a
125
R
µs
73
®
MONITOR
MONITOR
-2 devices.
®
-2 Interface
D
D
Functional Description
C/I
C/I
Data Sheet 01.99
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PEB 2091
PEF 2091
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ITD09788