1818 Agere Systems Inc.
Product Description
February 21, 2003
622/155 Mbits/s SONET/SDH x DS3/E3/DS0/E0
TMXF33625 Hypermapper
5 Block Description (continued)
5.6 SPE/AU-3 Mapper (SPEMPR) Block
The SPE mapper functional block (24 per device) operates
either as an AU-3/STS-1 mapper or as a TUG-3 mapper . In
either mode, it maps/demaps data from/to either the VT
mapper, the M13/E13 MUX/deMUX, the DS3/E3 clear
channel, or the DS3/E3 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 DS3 mapping mode, the SPE mapper functional block
accepts/delivers structured DS3 data from/to the M13
functional block or a clear channel DS3 signal at
44.736 Mbits/s rate and maps/demaps it asynchronously
to/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 AU-3/STS-1 needs to be remapped as a TU-3
signal or vice versa. B3ZS encoding/decoding is included.
The E3 mapping mode is similar in functionality to that of
the DS3 mapping mode just described.
This functional block also connects to the path overhead
access channel (POAC) to insert/drop path overhead bytes
J1, C2, F2, H4, F3, K3, and N1 into/from the STS-1 SPE or
VC-3.
The SPE mapper functional block complies with GR-253-
CORE, T1.105, ITU-T G.707, ITU-T G.831, G.783, and ETS
300 417-1-1.
5.7 VT/TU Mapper (VTMPR) Block
The VT/TU mapper (12 per device) maps any valid combi-
nation 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:
■28 asynchronous, byte-, or bit-synchronous DS1 signals
are mapped into seven VT groups or TUG-2s.
■28 asynchronous, byte-, or bit-synchronous J1 signals
are mapped into seven VT groups or TUG-2s.
■21 asynchronous, byte-, or bit-synchronous E1 signals
are mapped into seven VT groups or TUG-2s.
■Maps DS1 into VT1.5/TU-11/TU-12, J1 into VT1.5/TU-11/
TU-12, and E1 into VT2/TU-12.
ADM applications are supported via tributary loopback,
tributary pointer processing, and a low-order path overhead
access channel.
The VT/TU mapper supports automatic generation or
microprocessor overwrite of 1-bit RDI-V, enhanced RDI-V,
1-bit RFI-V, automatic downstream AIS generation, and five
J2 trace identifier modes.
The VT/TU mapper complies with GR-253-CORE, G.707,
T1.105, G.704, G.783, JT-G707, GR-499, and ETS 300
417-1-1.
5.7.1 Receive Direction
In the receive direction, the VT mapper terminates the data
stream it receives from the SPE mapper. It demultiplexes
the AU-3/TUG-3 into the VTs/TUs and checks the H4
multiframe alignment. A pointer interpreter for up to
28 VTs/TUs detects LOP, AIS, NDF, NORM, INC, and DEC
on each channe l.
The low-order path termination includes V5 byt e
termination, J2 path trace, Z6/N2 tandem connection,
Z7/K4 enhanced RDI-V and low-order APS monitoring, and
the payload termination for asynchronous, byte- or bit-
synchronous signals. The V5 byte termination performs
BIP-2 check (bit or block mode), REI-V count, RFI-V, and
RDI-V detection, signal label monitoring, and automatic
AIS-V insertion (which can be inhibited).
The J2 monitor supports the following modes:
■Cyclic check
■SONET framing mode
■SDH framing mode
■Single byte check
In byte-synchronous mode, the receive demapper
generates a frame synchronization signal to indicate the
DS1 frame bit or the MSB of the E1 time slot 0. Additionally,
it provides the framer access to the received signaling bits.
Output of the VT mapper is a DS1/J1/E1 signal with a
gapped clock. It can be overwritten with AIS automatically
or upon microprocessor request.
5.7.2 Transmit Direction
In the transmit direction, the VT mapper gets a clock, data,
and frame synchronization signal from the multirate cross
connect. The input is retimed and is checked for a digital
loss of clock (LOC), an AIS condition, and low zeros
density. In byte-synchronous mode, the input signal is
additionally checked for loss-of-frame (LOF).