CTC Union ETU01-Plus, Руководство пользователя

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Chapter 1. Introduction
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In the previous application, the ETU01-Plus is connected over hardwire point to
point. The ETU01-Plus can also be connected to an E1 network or to E1's provided
by SDH equipment. Within the SDH network, the E1 can be cross mapped at the
VC12 level to provide point to point connections.
Figure 1.7 E1 Point-to-Point over SDH Application
In these cases the E1 timing will be set to "Recovery" to synchronize to the SDH
network's timing. In the following example, one unit will provide the E1 timing either
by using its internal oscillator.
Figure 1.8 Application with Channelized E1