Mitel 50005070 Instruction Manual download pdf (Page 271)

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Basic Troubleshooting and Repair

Troubleshooting T1 Trunks (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 and signaling are dealt with separately.

Figure 30: TI Trunk Synchronization

Synchronization

The T1 trunk establishes and maintains a connection between the two

systems. Sampling clocks of each partner must be synchronized.

- The Master-Slave arrangement defines the leader and follower; if

connecting to a Public Network T1, the PBX will always be a slave.

- 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.

- When the PBX is connecting to more than one T-1 signal, choose the

order of preference of clocking sources in CDE Form 44, T1 Network

Sync (always choose a connection as close as possible to the defined

master source clock).

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