Keywords: SCT, LIU, framer, T1, E1, J1, single chip transceiver, t1 e1 j1, SCTs, line interface unit, LIUs, transceivers
Due to the numerous functions a transceiver can incorporate, this article will highlight some of the important features that designs require.
E1 is a European digital transmission format that carries up to 32 channels of voice whose multiplexed clock rate is 2.048Mbps.
Today, not only voice can be transported over a T1 or E1 line, but data as well, or a combination of both. T1 and E1 lines are used extensively in applications such as cellular base stations, business access routers, and private branch exchanges. Figure 1 shows a functional block diagram of a typical T1/E1/J1 SCT. Note: J1 is a variant of T1 that is used exclusively in Japan.
Figure 1. Functional block diagram of a typical T1/E1/J1 single-chip transceiver.
In a traditional T1/E1/J1 design, the LIU and framer would be separate ICs. However, very large-scale integration technology has allowed both parts to be combined onto a single silicon substrate. One feature to look for in a SCT is direct access to signals between the LIU and framer. This allows for functions, such as modifying the data stream or inserting code from an external source. Another benefit is the ability to tap bipolar streams for monitoring purposes.
To maximize robustness and clock reusability, choose a SCT that offers jitter attenuation that can be applied to the transmit or receive path. Some products also offer two jitter attenuation buffer depths for applications that require robust operation with large jitter present or that require lower latency.
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