Configuring Span Lines 1 and 2
2-3
This diagram represents this process.
Configure the NAC framer to respond or ignore the loop-up/loop-down
pattern from the Telco.
Menu Option 4 Configuring the span line’s jitter attenuation
Jitter attenuation on the span line enhances the network interface card
(NIC) tolerance to jitter. The NIC’s hardware provides a 193-bit frame
buffer to compensate for low frequency jitter on the network.
This option allows you to attenuate jitter on the receiving (from switch to
you) and the transmitting (from you to switch) sides. It defaults to the
attenuate jitter on the transmitting side.
If you are using the Dual Channelized T1 (386) NAC with a Short Haul
(DSX-1) NIC, jitter attenuation is only allowed on the receiving side.
Menu Option 5 Configuring the span line’s transmit line build out
The span line’s transmit line build out is a configurable output attenuation
that can be set to satisfy T1 circuit requirements.
Encoded HDB3 Signal
Bit Stream
Framer Circuitry
Line Interface Unit
Transformer
