Digium TE820 User Manual download pdf (Page 27)

Chapter 2: Card Installation

Connecting Timing Cables

The timing port allows up to three TE800 Series cards to share the same

sync (timing) source from the T1 line provider, or provide a consistent

sync source across multiple cards. This is a useful feature for fax modes

and some voice applications to prevent corruption due to timing slips on

the second, or third cards.

To utilize this feature, daisy-chain the P3 connector between each card

using the Digium 3-position, 10-pin timing cable. See Figure 8 on page 28

for an example.

Note: Certain previous model Digium products use a Legacy Timing

Port instead of the Differential Timing Port (P3 connector). If a card is

installed that has only a Legacy Timing Port, daisy-chain the P4

connector between each card using the Digium 4-position timing

cable. See Figure 9 on page 29 for an example.

Enable this feature in the drivers using the

timingcable=1 switch when

the drivers are loaded:

# modprobe wct4xxp timingcable=1

Note: Do not hook up the Differential Timing Port and Legacy Timing

Port at the same time. Only one can be used at a time.

Digium, Inc. Page 27

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Digium TE820 User Manual Page 27