Chapter 3 Channelized T3 Trunk Card
CT3 Trunk Card Overview
Clocking
All Cisco AS5800 access server trunk cards use the same transmit clock. This clock can originate from the following sources:
•TDM clock
•External clock
Clocks are prioritized by slot number (slots 0 to 5). The
The trunk card then forwards the clocks to the dial shelf controller. The dial shelf controller selects the
Instead of using the default algorithm for clock selection, you can specify clocks through global configuration and select a maximum of two clocks per trunk card.
If you configure fewer than two clocks on a trunk card and all other configured clocks fail, clock selection resorts to the default algorithm on that card and the second clock will be selected automatically.
CT3 Clocking
CT3 trunk cards are usually attached to an external device, such as a Digital Access and Crossconnect System (DACS) or
CT1 Clocking
The CT3 trunk card has 28 T1 framers that always get their clock from the line. As a result, configuration of T1 clock sources is not allowed.
LED and Alphanumeric Indicators
The CT3 trunk card front panel is designed with LED and alphanumeric displays to provide trunk card status. (See Figure
Cisco AS5800 Universal Access Server Dial Shelf Card Guide
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