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2 Transport aspects

Annex S

NT software upgrade
(This annex forms an integral part of this Recommendation.)

Editorial note: This annex was introduced by Cor.3 to ITU-T G.9701, but is not shown in revision marks for
readability purposes.

S.1 Scope

This annex provides means to upgrade the software of an NT where the executable software can be
upgraded with a single vendor-specific image file. The executable software may exist in multiple parts of
the equipment (e.g., DSP firmware and higher layer application software). Two images are maintained at
the NT so that one can be upgraded while the other one is executed. The contents of this software image
file and the upgrade of individual components of an NT are beyond the scope of this annex.

This annex is beyond the scope of transceiver functionality and is optional for system implementations.

S.2 References
[IETF RFC 1321] R. Rivest, "The MD5 Message-Digest Algorithm, 1992", IETF RFC 1321, April 1992.

[ITU-T I.363.5] Recommendation ITU-T I.363.5 (1996), B-ISDN ATM Adaptation Layer specification :
Type 5 AAL.

S.3 Reference model
The reference model for the NT software upgrade is shown in Figure S.1. It contains the associated OAM
entities of the DPU and NT. The DPU entity contains the software image management function as a part of
the ME-O. The ME-O will act as a master for the software image upgrades at the ME-R, which contains two
instances of software images (0 and 1). Those two instances of software images at the NT are managed
independently by the software management function of the DPU. Additional vendor specific files may be
managed (see clause S.4.2).

Figure S.1 – Software image management reference model

The status of each software image at the ME-R is reflected in DPU-MIB. The ME-O and ME-R use a
transparent communication channel to exchange software management commands and data between
them as system-related OAM data. The clauses of this annex describe the software image management
process and the details of messages exchanged.

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