28500-DSH-002-C Datasheet, PDF (211/224 Pages) M/A-COM Technology Solutions, Inc. – Multichannel Synchronous Communications Controller

TSBUS
Table E-3. System Side Interface: Overhead Time Slot Bus Frame (2 of 2)
TSBUS Source/Destination
Overhead Data Communication Channel Mapped to Virtual Serial Port (VSP)
Description
Data Rate
SONET/SDH STS-1/AU-3 Mapper
Unused Communication Time Slots
Command Status Processor (CSP)
SPE/AU Path Overhead Nibble N1 (4 LSBs) Path Data Channel/Bit
Oriented or LAPD Tandem Connection
Future Use
CSP Channel. Used to control/monitor CX29503 device.
32 Kbps
3.564 Mbps
6.48 Mbps
E.1.1
VSP Mapping of Intermixed Digital Level 2 Signals
The information in this subsection relates to the way a CX29503 device presents channels of various types of
mappings to the CX28500 on the TSBUS. It is reproduced from the CX29503 datasheet in order to make the
explanation of the timeslot assignments complete.
The following Digital Level 2 signals can transport either DS1 or E1 signals: VTG, TUG-2, and DS2. SONET, SDH,
and PDH transport their respective Level 2 signals in sets of seven Level 2 signals. This set of seven Level 2
signals can operate in mixed mode where a portion of the seven Level 2 multiplexed signals transport DS1 signals
and the remainder transport E1 signals. Any given Level 2 signal in mixed mode can only transport DS1 signals or
E1 signals. It cannot transport both signals.
Table E-4 defines the mapping of DS1 and E1 signals when they are extracted from a mixed set of seven VTG’s, a
mixed set of seven TUG-2s, or a mixed set of seven DS2s.
Each level 2 signal has a set of 3 or 4 related framers. All framers within a set must be configured for the same type
of signal. This prevents framers for different data paths from multiplexing data into the same time slot.
There are four framers in a set for DS1, VT1.5, and VC-11 signals. There are three framers in a set for E1, VT2.0,
and VC-12 signals.
The types of Level 2 signals that can be mixed together are limited to the following combinations:
1. DS2 signals containing DS1 signals and the DS2 signals containing E1 signals.
2. VTG signals containing VT1.5, which contain DS1 signals and VTG signals containing VT2.0, which contain E1
signals.
3. TUG-2 signals containing VC-11, which contain DS1 signals and VTG-2 signals containing VC-12, which
contain E1 signals.
Table E-4. VSP Mapping of Intermixed Digital Level 2 Signals Containing Either DS1 or E1 Signals
(1 of 2)
Framer Set No.
Framer No.
Concatenated Time Slot Numbers
Framer Configured to
Extract DS1 Signal
Framer Configured to
Extract E1 Signal
VSP No.
1
1
2
2
3
3
4
4
5
5
1, 29, 57
2, 30, 58
3, 31, 59
4, 32, 60
5, 33, 61
1, 22, 43 64
1
2, 23, 44, 65
2
3, 24, 45, 66
3
4, 25, 46, 67
4
5, 26, 47, 68
5
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