CTC Union TRM01, Руководство пользователя

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Chapter 1. Introduction
6
TRM-01 APR 2000
1.5 Applications / Capabilities
In the following example, the
TRM-01
is installed at an ISP's central
office and provides "last mile" access to corporate customers over dedicated T1
transmission lines. The customer site utilizes a single data port CSU/DSU,
which could be one of our pack series or standalone units. While utilizing
fraction T1 connections, the ISP can provide a variety of bandwidth options to
its customers. By varying timeslot assignments, data rates from 64Kbps up to
1536Kbps may be utilized in frame mode.
The FT1 Cards in the TRM-01 could all be set to internal oscillator
timing or they could receive timing from the DTE on the data port. The remote
units would all be set to recovery.
Figure 1-2 : T1 nest for ISP
In the next application example, the
TRM-01
is used in a point-to-point
T1 line environment. Each FT1 Card acts as a stand alone Digital Access Unit,
connecting individual T1 lines to data port interfaces or bridging Ethernet LANs.
For any T1 link, one CSU/DSU should provide internal timing while the linked
unit should be set to recovery.
Figure 1-3 : Point-to-point Application of TRM-01