PDF of this tutorial
Definition
A multifunction, multiservice access platform (MMAP) combines numerous functions, services, access technologies, and protocols in one network element. This flexibly configurable network element simplifies network design, planning, rollout, and network management. Typical functions include the following:
- Optical carrier (OC)–3c/12c/48c optical multiplexer
- T3/OC–3c aggregator
- Digital signal (DS)–0/1/3 cross-connect
- Multiprotocol generic requirement (GR)–303 gateway
- Asynchronous transfer mode (ATM) switch
- Internet protocol (IP) router
Access technologies include the following:
- T1
- T1–inverse multiplexing over ATM (IMA)
- T3
- Asymmetric digital subscriber line (ADSL)
- Symmetrical DSL (SDSL)
- Single-line high–bit rate DSL (SHDSL)
- Integrated services digital network (ISDN) DSL (IDSL)
- Ethernet
Time division multiplexing (TDM), frame relay, ATM, and IP are supported as protocols. The MMAP is used together with intelligent integrated access devices (IAD) in order to provide an optimized network architecture and transport efficiency from the customer premises into the metropolitan area network (MAN).
Overview
Local-exchange carriers (LEC) face a variety of challenges. High on the list (particularly for competitive LECs [CLEC]) are capital resource constraints and limitations on rack and equipment space. Add to this the wide variety of customer requirements for voice and data access. These multiple access requirements complicate life for the LEC, as they force the carrier to make a choice between a service-specific approach (frame relay DSL–only, for example) and a multiple-service approach. The service-specific approach, while simplifying things for the carrier, risks losing customers due to inflexibility. The multiple-service approach, however, typically requires the carrier to use multiple overlaid access networks to service each geographical area. This basic dichotomy is, really, the heart of the carrier's dilemma. Multiple overlaid access networks typically entail using lots of equipment, which exacerbates the capital-requirements problem, the space problem, and multiple network management issues. This tutorial describes a new class of equipment that exactly addresses the LECs' needs. MMAPs are described and several typical application examples are provided.
