TMXF28155 Datasheet, PDF (398/606 Pages) Agere Systems – TMXF28155 Super Mapper 155/51 Mbits/s SONET/SDH x28/x21 DS1/E1

TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet
May 2001
18 SPE Mapper Functional Description (continued)
18.1 Introduction
This section describes the functions of the SPE mapper block.
The SPE mapper is highly configurable; it can operate in two different modes, as an AU-3/STS-1 mapper or as a
TUG-3 mapper. In both modes, it can map/demap data from/to either the VT mapper block, the M13 MUX/deMUX
block, the DS3 clear channel, or the DS3 loopback channel.
The SPE mapper supports numerous automatic monitoring functions. It can provide interrupts to the control sys-
tem, or it can be operated in a polled mode.
Additionally, this block has a built-in auxiliary channel known as the path overhead access channel (POAC). This
channel is mainly used for path overhead insertion and drop functions.
18.2 Features
s The SPE mapper accepts/delivers TUG-2 data from/to the VT mapper. The TUG-2 data is mapped/demapped
either to/from an AU-3/STS-1 signal for the North American digital systems or to/from a TUG-3 signal for the
European digital systems.
s Flexibility down to TUG-2 level is provided for choosing which TUG-2s (between 1 and 7) are mapped into which
TUG-3s (between 1 and 3) for generating STM-1 signals. Similarly, any TUG-2s (up to 7) may be dropped/termi-
nated from the 21 TUG-2s of an STM-1 signal.
s The SPE mapper accepts/delivers DS3 data from/to the M13 MUX/deMUX. The DS3 data is mapped/demapped
either to/from an AU-3/STS-1 signal for the North American digital systems or to/from a TUG-3 signal for the
European digital systems.
s The SPE mapper accepts/delivers a clear DS3 signal at 44.736 Mbits/s rate. The clear DS3 signal is mapped/
demapped essentially the same way as M13 signal described above.
s The SPE mapper has a DS3 loopback circuit placed for the functions of demapping and remapping 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 TUG-3 signal or vice versa.
s The SPE mapper supports a path overhead access channel more commonly known as the POAC channel.
Seven path overhead bytes namely J1, C2, F2, H4, F3, K3, and N1 may be inserted/dropped through this chan-
nel. This channel works as the master which means that this channel provides a clock in both transmit and
receive directions and POH data may be inserted by the user on the transmit side or dropped by the block in the
receive side.
s Path overhead byte B3 (BIP error) generation/detection and programmable BIP-2 bit error rate insertion.
s Programmable clear on read/clear on write registers.
s Signal fail and signal degrade indicators available to report bit error rates above a certain programmable thresh-
old.
s Capable of detecting/inserting alarm indication signals (AIS), remote defect indication signals (RDI) and remote
error indication signals (REI).
s Numerous monitoring functions provided on all the TUG-3 path overhead bytes.
s Supports unidirectional path switch ring (UPSR) applications.
s N1 tandem connection support is provided.
s Complies with GR-253-CORE, T1.105, ITU-T G.707, ITU-T G.831, G.783, ETS 300 417-1-1.
398
Agere Systems Inc.