SHDSL configurations

Applications

There are two application possibilities for the SHDSL feature:

End-user access for E1 via a E1 NTU (NT2M modem)
End-user access for Ethernet using a 10Base-T or a 100-Base-TX interface via an Ethernet NTU (NT10ETH modem). There can be one to four parallel SHDSL links to each NTU providing 2.2 Mbit/s to 8.7 Mbit/s throughput. Each NT10ETH modem has 1 or 2 Ethernet ports towards the end-user

The 1643 Access Multiplexer AM/1643 Access Multiplexer Small AMS has to be equipped with an X12SHDSL-V2/V3 option card and is then operating as LTU (Line Termination unit). All ports of the X12SHDSL-V2/V3 option card operate either in the E1/SHDSL mode or in the TU12/SHDSL mode.

An E1 modem provides one E1 user interface and one single SHDSL link. This means a one-to-one correspondence between an LTU SHDSL port, the NT2M and the E1 end-user interface.

An NT10ETH modem has two 10/100BASE-T(X) interfaces and can have one to four parallel SHDSL links, that are all connected to the same X12SHDSL-V2/V3 option card.

Each SHDSL link can have up to two SHDSL Regenerator Units (SRUs) depending on the span connected to the LTU port. Each SRU supports one SHDSL link.

The following figure shows a network example with a 1643 Access Multiplexer AM/1643 Access Multiplexer Small AMS configured as LTU with 12 SHDSL links connected.

Interworking with third party equipment

1643 Access Multiplexer AM/1643 Access Multiplexer Small AMS supports the following types of third party SHDSL equipment:

E1 Network Termination Units (NTUs) for E1 over SHDSL
E1 NTUs for TU-12 over SHDSL
Ethernet NTUs
SHDSL Regenerator Units (SRUs) (up to two per LTU port)

The following table gives an overview of the features support in dependence of the release and the SHDSL option card:

Releases 1.0 to 5.0/X12SHDSL option card (CC109177204)	Release 6.1/X12SHDSL-V2 option card (CC109579912) or X12SHDSLoption card (CC109177204) Release 7.2.11/X12SHDSL-V3 option card (CC109782565)	Release 6.1/X12SHDSL-V2 option card (CC109579912) Release 7.2.11/X12SHDSL-V3 option card (CC109782565)
support of TU-12 mode and E1 NTUs for TU-12 over SHDSL (NT2M)	support of TU-12 mode and E1 NTUs for TU-12 over SHDSL (NT2M)	SW download to NTU possible
support of E1 mode and E1 NTUs for E1 over SHDSL (NT2M)	support of E1 mode and E1 NTUs for E1 over SHDSL (NT2M)
	support of Ethernet NTUs (NT10ETH)	SW download to NTU possible
	support of SRUs	SW download to SRU possible
support of a certain set of third party SHDSL equipment (for detailed information, please contact the local sales organisation of Alcatel-Lucent.)	support of a certain set of third party SHDSL equipment which is different from the one offered in previous releases (for detailed information, please contact the local sales organisation of Alcatel-Lucent.)

Important! Please note that an in-service upgrade of the SHDSL option card from an older release to Release 6.1 and later versions is not possible. It is always necessary to unassign the X12SHDSL card completely, so that all connections are removed. Then the upgrade can be done and the X12SHDSL card can be assigned and configured from scratch.

E1 and TU12 payload mapping

The 1643 Access Multiplexer AM/1643 Access Multiplexer Small AMS LTU supports two types of payload mapping into the SHDSL signal:

E1 mode, maps an E1 directly into the SHDSL signal
TU-12 mode, maps a TU-12 containing a VC-12 into the SHDSL signal. The VC-12 may contain various signal types, e.g. E1, Ethernet data, etc.

NTU management

The third party NTU modems can be managed remotely. For this purpose a communication channel is reserved in the SHDSL overhead, called the EOC (Embedded Operations Channel). The message set ist defined in ITU-T Rec. G991.2. This message set deals with SHDSL layer aspects. Additionally there is a proprietary extension, here called EOC- ext. which addresses the non-SHDSL aspects of modem management. This proprietary message set enhances the standard EOC messages by messages covering the interface towards the end-user.

Naming system for SRUs and NTUs

The LTU can manage up to 12 NTUs and 24 SRUs. In order to identify the particular SRU or NT quickly, a fixed naming scheme is to be used for NTU and SRU identification on the GUIs that allows easy recognition of the relative location of the device:

Each NTU or SRU is identified with a four digit number prefixed with a string “SRU” or “NTU” depending on the object that is addressed.

The first digit indicates the slot number in which the SHDSL unit is inserted in the LTU. For 1643 Access Multiplexer AM/1643 Access Multiplexer Small AMS this value is “2”.

The following two digits indicate the LTU port number, ranging from 01 to 12, corresponding with the TP 1 to TP12 numbering that is used on the X12 SBDSHL faceplate.

The last digit can be “1”, “2” or “3”. The “1” is used for the NTU, while “2”and “3” are used for numbering the SRUs, starting from the SRU connected to the LTU and numbering incrementally in the direction of the NTU.

For NT10ETH NTUs, the LTU port number connected to NTU port #1 is used.

The following figure shows an example for the name assignment:

Alcatel-Lucent – Proprietary

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