PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 60

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

TE Timing Mode (SPM=0)
The frame is composed of three channels (figure 29):
* 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 bus arbitration (access to the TIC bus). Only the Command/
Figure 29
Definition of IOM
The IOM-2 signals are:
IDP0, 1
DCL
FSC1
In addition, to support standard combos/data devices the following signals are generated as
outputs:
BCL
SDS1/2
Important Note: If the ISAC-S is configured in NT mode, the IOM frame structure is identical
Semiconductor Group
channels for the layer-1 device.
Command/Indication channels for other IOM-2 devices.
Indication bits are used in channel 2. See section 2.4.6 for details.
FSC1
IPD0
(DD)
IPD1
(DU)
SDS1
/2
:
: 1536 kHz output
:
: 768 kHz bit clock
:
B1
B1
768 kbit/s (IDP0 = Data downstream (DD); IDP1 = Data upstream (DU))
8 kHz programmable data strobe signals for selecting one or both B/IC
8 kHz output.
®
to that of the IOM-1 case.
-2 Channels in Terminal Timing Mode
IOM -2
B2
B2
channel(s).
R
MON0
MON0
CH0
D
D
MR
MR
CI0
CI0
MX
MX
IC1
IC1
IOM -2 CH1
IC2
IC2
60
125 µs
R
MON1
MON1
CI1
CI1
MR
MR
MX
MX
Functional Description
IOM -2 CH2
R
BAC
S/G
TAD
ITD05968
A/B