| 摘要 |
A system which enables a customer to obtain E1 access between the customer's premises (CP) and an E1-compatible network when the customer is unable to obtain an E1 line between the CP and the network is disclosed. A single multiplexer at a customer premises (CP) and a single multiplexer at a network point of presence (POP) are utilized to provide E1 access between the CP and the network POP. Each multiplexer comprises three E1 interfaces and four T1 interfaces. One E1 line is connected to each of the three E1 interfaces of the CP multiplexer. Similarly, one E1 line from an E1-compatible network is connected to each of the three E1 interfaces of the POP multiplexer. Each of the four T1 interfaces of the CP multiplexer is connected to one of the four T1 interfaces of the POP multiplexer. The CP multiplexer receives data from the three E1 lines and maps this data onto the four T1 lines. The POP multiplexer receives the data from the four T1 lines and maps the data onto three network E1 lines. In a similar manner, the CP multiplexer and the POP multiplexer enable E1 format data to flow from the network POP to the CP.
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