tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 398

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
18 SPE Mapper Functional Description
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
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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.
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.
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.
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.
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.
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.
Path overhead byte B3 (BIP error) generation/detection and programmable BIP-2 bit error rate insertion.
Programmable clear on read/clear on write registers.
Signal fail and signal degrade indicators available to report bit error rates above a certain programmable thresh-
old.
Capable of detecting/inserting alarm indication signals (AIS), remote defect indication signals (RDI) and remote
error indication signals (REI).
Numerous monitoring functions provided on all the TUG-3 path overhead bytes.
Supports unidirectional path switch ring (UPSR) applications.
N1 tandem connection support is provided.
Complies with GR-253-CORE, T1.105, ITU-T G.707, ITU-T G.831, G.783, ETS 300 417-1-1.
(continued)
Agere Systems Inc.
May 2001