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Configuring E1 Cards
Configuring overlap receiving on PRI lines
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide Preliminary May 9, 2000 9-13
admin> set loop-avoidance = 7
admin> write
Configuring overlap receiving on PRI lines
Overlap receiving affects the procedure of establishing an incoming call received on a T1 or
E1 PRI line in the TAOS unit. With overlap receiving, the TAOS unit can gather the complete
called number from the network switch via a series of Information messages, enabling the use
of features such as called-number authentication. For information about configuring overlap
receiving on PRI lines, see Chapter 7, “Configuring T1 Cards.”
Configuring clocking
You can configure the TAOS unit to use any of the E1 lines as a master clock source for
synchronous connections for an entire system. In synchronous transmission, both the sending
device and the receiving device must maintain synchronization in order to determine where
one block of data ends and the next begins.
From the E1 lines configured as eligible clock sources, the TAOS unit chooses a clock source
on the basis of priority. If multiple E1 lines are configured as eligible clock sources and have
an equal clock priority, the TAOS unit chooses one of them at random. Once chosen as the
clock source, the line is used until it becomes unavailable or a higher-priority source becomes
available.
If no eligible external sources are available, the system uses an internal clock generated from
the primary shelf controller. Using the internal clock is generally not recommended.
The Clock-Source diagnostic command displays the current master clock source. Enter the
command on the shelf controller to display which slot (if any) is being used as the clock
source. Enter the command on an E1 card to display which line is used.
To specify a clock source and set a priority, proceed as follows after reading in the line’s E1
profile:
admin> set clock-source = eligible
admin> set clock-priority = high-priority
admin> write
Configuring the front-end E1 transceiver
The front-end type of the E1 transceiver can be short haul or long haul. Long haul is only for
lines using 120-ohm termination.
Specify the front-end settings as follows, after reading in the line’s E1 profile:
admin> set front-end-type=[short-haul|long-haul]
admin> write