Paradyne manual CPX-1000 Voice Services Platform Description 1000-A2-GN22-00

T1 module failure—oversize the capacity of the T1 interface for a fully operational system (Figure 2–9A) so that the interface can still handle the busy hour call volume even when one of the T1 modules has failed (Figure 2–9B).

2. CPX-1000 Voice Services Platform Description 1000-A2-GN22-00

PSTN Modules The CPX provides complete support of the GR-303 protocol, including full GR-303 line concentration, all CLASS and calling features, full EOC, TMC, and path protection switching.

The CPX supports eight T1 interface groups (IGs). Each T1 port is independently assigned to an interface group, and each interface group supports up to 28 T1 ports. The CPX also supports path protection switching for the control channels in the GR-303 interface group.

T1 Load Sharing T1 load sharing is implemented by designing in excess capacity. Overcapacity protection means the capacity of the T1 interface is maintained when one of the following failures occurs even at the busy hour call volume:

￿T1 port failure—interface groups comprise T1 ports and ￿are arranged across T1 modules so that IGs are shared

among T1 modules (Figure 2–10). The shared arrangement provides a backup T1 port to each T1 module should one of the IG groups fail.

The illustrations below show how to implement primary and secondary module pairs, and group the T1 ports in Interface Groups across the cards, using Octal T1 cards for clarity.

When implementing PSTN using 12-port T1 ECAC modules, you attach the RJ-21X cable from each 12-port T1 card to a patch panel to split out each T1 port separately for connection as usual. T1 modules are paired as primary and secondary modules, and group the T1 ports into Interface Groups across cards in the same manner.

Caution

Do not put primary and secondary DS1 links on the same T1 module. Doing so prevents new calls from being made if one T1 module fails.

2-20 February 2003