Cisco AS5800 Manuel - Page 5

Parcourez en ligne ou téléchargez le pdf Manuel pour {nom_de_la_catégorie} Cisco AS5800. Cisco AS5800 22 pages. Access server channelized t1/e1 trunk cards
Également pour Cisco AS5800 : Manuel (16 pages)

Imprimer la page

Each individual T1 or E1 port can be used as the system clocking

reference. Each CT1 or CE1 trunk card can supply two clocks from

any two of its twelve ports. You can assign priorities to these

clocks, or accept the default values assigned by the software.

Default values for clocking are based on the following parameters:

(a) Ports are prioritized from 011. The port with the

lowest number has the highest priority.

(b) Slots are prioritized from slot 0 to slot 5. The lowest

slot number has the highest priority.

priority clock is selected from the card in slot 0. If this

clock fails, the highest priority clock from the card in

slot 1 becomes the default clock, and so forth.

The trunk card then forwards the clocks to the dial shelf controller.

The dial shelf controller selects the highest priority clock as the

system primary clock, and the rest of the clocks remain in a

prioritized backup queue.

Instead of using the default algorithm for clock selection, you can

specify clocks through configuration. You configure the clocks

globally, and can select a maximum of two clocks per trunk card.

For example, if you install three trunk cards, you can configure up

to six clocks. (While two trunk cards are sufficient to give full

coverage to ten modem cards, you can have up to six trunk cards

seated in slots 0 through 5 for a maximum selection of twelve

clocks.)

If you configure fewer than two clocks on a trunk card and all other

configured clocks fail, the clock selection will resort to the default

algorithm on that card and the second clock will be selected

automatically.

•

Process counting information for performance monitoring

•

Support online insertion and removal (OIR)

The trunk card supports OIR, a feature that allows you to remove

and replace trunk cards in the Cisco 5814 dial shelf while the

system is operating without disrupting other cards and their

associated calls. If you remove a trunk card while the system is

operating, all calls associated with the 12 E1 or T1 lines on that

card are dropped. Calls being handled by other trunk or modem

cards, however, are not affected.

shows two trunk cards installed in a fully configured Cisco 5814 dial

shelf chassis.

Figure 4 Cisco 5814 Dial Shelf Chassis Fully Configured with Trunk

Cards Installed

LED Indicators

The CT1 and CE1 trunk card front panel is designed with LED

indicators and a liquid crystal display (LCD) to provide trunk card