The PA-MC-STM-1 is a single-wide, channelized STM-1 port adapter designed to address the demand for SDH network connections on the Cisco 7600, 7500, 7200, and FlexWAN modules. The port adapter enables users to channelize an STM-1 down to 64 kbps using a variety of encapsulations on as many as 256 logical channels. The time slots in each E1 can be grouped into several individual logical channels, each of which can carry data with different data link layer protocols.The PA-MC-STM-1 is ideal for today's rapidly expanding WAN environment. The port adapter meets a variety of service interconnect requirements, including concurrent support for leased line and Frame Relay. Enterprises and service providers can connect the adapters' STM-1 ports into these services for aggregation of a large number of remote sites. As an integral part of a service node where customer bandwidth needs are uncertain, the single-port PA-MC-STM-1 allows service providers to avoid determining beforehand how ports will be allocated between DS0, NxDS0, and E1. For enterprises, the flexibility to support multiple remote-site connections with a variety of speeds and encapsulations reduces circuit and equipment expenditures by integrating the capabilities and services of numerous port adapters onto a single adapter.An enterprise's need for applications and speed dictates flexible and scalable solutions. The PA-MC-STM-1 enables customers to scale services by upgrading bandwidth from DS0 to E1 connections - all without changing the port adapter in their Cisco 7XXX series routers. The additional ability to support "convenience" DS0 connections is an important factor for some end users who are planning to increase capacity in the future, but require continued support for today's existing connections.