PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Figure 2 is an application utilizing 4 PM6341 E1XC chips and a Mitel MT8980
Digital Time/Space Switch to implement a simple DS0 cross-connect. An
alternate architecture could use two MT8980, one as a voice switch and the
other as a signalling switch, and 8 E1XCs to cross-connect 8 E1's. ( Note: a true
implementation would require redundancy in the switch core.)
The "system frame pulse" signal is stretched through the two D-FF into a pulse
of 488ns duration, which is used to frame align the data out of each E1XC
through the elastic store and to provide frame alignment indication to the
transmitters. The raw system frame pulse signal is used to indicate frame
alignment synchronization to the MT8980. Another D-FF is configured as a
toggle to generate a 2.048MHz clock from the system 4.096MHz clock source,
synchronized to the system frame pulse.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
9
PMC [ PMC-SIERRA, INC ]
