PCM Upstream has been discussed in the standards bodies for several years. To provide overall industry-wide support, it has been combined with quick connect and Modem-On-Hold™ (MOH) to provide an acceptable solution to all involved parties. PCM Upstream operates in a topology similar to that of V.90, where there must be only one analog loop, between the APCM and the central office.

Unlike quick connect and MOH, PCM Upstream does not fundamentally change the modem’s user model. It does provide some extra utility for services that require more symmetric data flow.

PCM Upstream boosts the upstream data rates between the user and ISP to reduce upload times for large files and email attachments. A maximum of 48 Kbps upstream rates is supported. PCM Upstream will work particularly well with new equipment such as Internet-connected digital cameras, which primarily upload rather than download information.

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