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10-6 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
Configuring E1 FrameLine Cards (MAX TNT, DSLTNT)
Configuring the clock source
Configuring the clock source
The E1 FrameLine slot card uses the same system-wide PLL synchronous clock source for
DS1 transmission as do the eight-port T1 and E1 cards. Any of the lines can serve as the clock
source for the unit. To configure the E1 FrameLine card’s clock source, use the same
parameters (Clock-Source and Clock-Priority) that you use for other cards.
All 10 lines must use the same clock source. Clocking on a per-line basis is not supported. The
clock source can be one of the 10 lines, or a line on another slot card, or it can be internally
generated from the primary shelf controller. Using the internal clock is generally not
recommended.
In addition, if the system clock source is from one of the 10 lines, it affects the timing on the
TDM backplane, because TDM timing is based on the clock source. This relationship exists
even though the E1 FrameLine slot card does not use the TDM backplane.