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Troubleshooting and Repair
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T1 Trunk (D4 DS-1)
A T1 Trunk is a digital trunking standard that supports multiple users.
Unlike analog trunks, the T-1 hardware signaling layer is independent
of trunk usage; synchronization & signaling are dealt with separately.
Synchronization
The T1 trunk establishes and maintains a connection between the
two systems. Sampling clocks of each partner must be
synchronized.
n
The Master-Slave arrangement defines the leader and follower;
if connecting to a Public Network T1, the PBX will always be a
slave.
n
The stratum clock levels define the accuracy of the clock and the
ability to match with the incoming master clock signal.The higher
stratum number synchronizes to the same or lower stratum
number. For example, a Stratum 4 (PBX) clock synchronizes to
a Stratum 3 (CO/PBX/Channel Service Unit) clock.
n
When the PBX is connecting to more than one T-1 signal,
choose the order of preference of clocking sources in CDE Form
Figure 18: T1 Trunk Synchronization
Содержание SX-200 EL
Страница 1: ...TECHNICIAN S HANDBOOK LIGHTWARE 19 RELEASE 3 0 ...
Страница 11: ...Chapter 1 Introduction ...
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Страница 55: ...Chapter 3 Troubleshooting and Repair ...
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Страница 111: ...Chapter 4 Programming ...
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Страница 169: ...Chapter 5 Installation ...
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Страница 175: ...Installation 165 Installation SX 200 ML FD Cabinet Card Assignment Figure 24 SX 200 ML FD Cabinet Card Assignment ...
Страница 176: ...Technician s Handbook 166 SX 200 LIGHT Cabinet Card Assignment Figure 25 SX 200 LIGHT Cabinet Card Assignment ...
Страница 239: ...Chapter 6 Maintenance Commands ...
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Страница 261: ...Notes ...
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