tmxf84622 ETC-unknow, tmxf84622 Datasheet - Page 16

• Manufacturer Part Number: tmxf84622
• Description: Tmxf84622 Mbits/s/622 Mbits/s Interface Sonet/sdh X84/x63 Ultramapper
• Manufacturer: ETC-unknow

TMXF84622 155 Mbits/s/622 Mbits/s Interface
SONET/SDH x84/x63 Ultramapper
2 The SONET/SDH Ultramapper
2.10 SPE/AU-3 Mapper (DS3 Mapper)
The SPE mapper block is a highly configurable mapper. It operates either as an AU-3/STS-1 mapper or as a TUG-
3 mapper. In both modes, it maps/demaps data from/to either the VT mapper, the M13 MUX/deMUX, the DS3 clear
channel, or the DS3 loopback channel. The SPE mapper supports numerous automatic monitoring functions and
provides interrupts to the control system, or it can be operated in a polled mode. In TU mapping mode, the SPE
mapper provides flexibility down to TUG-2 level for choosing which TUG-2s (out of 7) are mapped/dropped
into/from which TUG-3s (between 1 and 3) for generating STM-1 signals. This allows grooming of the VTs/TUs on
the STM-1 level (over all three devices). In a full STM-1 application, with two other devices sitting on the telecom
bus, care has to be taken for the provisioning of the time slots when each block drives the telecom bus.
In DS3 mapping mode, the SPE mapper block accepts/delivers structured DS3 data from/to the M13 block or a
clear DS3 signal at 44.736 Mbits/s rate and maps/demaps it asynchronously into/from the STS-1 SPE or a TU-3.
The DS3 mapper generates a fixed pointer value of 522. On the receive side, pointer interpretation is performed
detecting LOP , AIS, NDF, NORM, INC, and DEC. A DS3 loopback mode allows demapping and remapping of a
DS3 signal. It is particularly useful in cases where a DS3 signal mapped as an AU-3/STS-1 signal is needed to be
remapped as a TU-3 signal or vice versa. B3ZS encoding/decoding is included.
The same path overhead monitoring functions (as described above) are implemented in this block.
This block also connects to the path overhead access channel (POAC) to insert/drop the path overhead bytes J1,
C2, F2, H4, F3, K3, and N1 into the STS-1 SPE or VC-3.
Supports unidirectional path switch ring (UPSR) applications as well as N1 tandem connection function.
Complies with GR-253-CORE, T1.105, ITU-T G.707, ITU-T G.831, G.783, and ETS 300 417-1-1.
2.11 VT/TU Mapper
The VT/TU mapper maps any valid combination of DS1 and E1 signals into a stream at a rate of 51.84 Mbits/s
(STS-1 or AU-3). The mapping methods (VT1.5, VT2, and VT group in ANSI nomenclature; TU-11, TU-12, and
TUG-2 in ITU nomenclature) are analogous. The VT/VC mapper supports the following mappings:
ADM and unidirectional path switch ring (UPSR) applications are supported via tributary loopback, tributary pointer
processing, and low-order path overhead access channel.
Supports automatic generation or microprocessor overwrite 1-bit RDI, enhanced RDI, 1-bit RFI, automatic down-
stream AIS generation, and five J2 trace identifier modes.
Complies with GR-253-CORE, G.707, T1.105, G.704, G.783, JT-G707, GR-499, and ETS 300 417-1-1.
2.11.1 Receive Direction
In the receive direction, the VT mapper terminates the data stream it receives from the SPE mapper. It demulti-
plexes the AU-3/TUG-3 into the VTs/TUs and checks the H4 multiframe alignment. Pointer interpreters for up to
84 VTs/TUs detect LOP , AIS, NDF, NORM, INC, and DEC on each channel.
16
16
84 asynchronous, byte-, or bit-synchronous DS1 signals are mapped into seven VT groups or TUG-2s.
84 asynchronous, byte-, or bit-synchronous J1 signals are mapped into seven VT groups or TUG-2s.
63 asynchronous, byte-, or bit-synchronous E1 signals are mapped into seven VT groups or TUG-2s.
Maps T1 into VT1.5/TU-11/TU-12, J1 into VT1.5/TU-11/TU-12, and E1 into VT2/TU-12.
(continued)
Advance Data Sheet, Rev. 2
Agere Systems Inc.
July 2001