Loop Telecom AM3440 series, Руководство пользователя, Страница: 54 / 70

CHAPTER 7 SYSTEM SETUP
48
Bundle, Activate All, Stop Tx Bundle
Confirm Yes, No No
Note:
1. There are 4 ports to have UDP number from 1 to 65535. If one port gets UDP number such as 100,
another port cannot use the same UDP number.
2. If the user chooses “Add Bundle” option for Action, the bundle ID must be unique for the particular
port. If the user chooses “Delete Bundle” option, the particular bundle must already be created. The
UDP number needs to be unique for all the ports.
＊
Delay should be smaller than size. Also, the difference between size and delay should be larger
than the time that it takes to reconstruct a packet (otherwise an overrun may occur when the packet
arrives). Configuring the Jitter Buffer parameters correctly avoids under-run and overrun situation.
Under-run occurs when the Jitter Buffer is empty (the entering rate is lower than the exiting one). In
case of an under-run event, the chip transmits conditioning data instead of actual data towards the
TDM interface. Overrun occurs when the jitter buffer is full and there is no room for new data to
enter (the entering rate exceeds the exiting one). Under-run and overrun require special treatment
from the chip HW, depending on the bundle type.
size
delay
This area is empty and can
be used to store incoming
bursts
This area is full and there
is still data to send on the
line if incoming data is
missing due to network
delays.
Figure 7-2 Jitter Buffer Diagram
7.4. Alarm Setup
¾ Command Path Main Menu > (M) Alarm Setup
¾ Function Enables users to change the Alarm for each type, and the
threshold for ARP/bundle, RX-Lost/bundle, and
Cell-Lost/bundle
y xx/bundle: each alarm is based on a bundle, i.e., every
bundle has its own alarm
y Rx-Lost/bundle: Rx-lost means the received packet
sequence number is not the same as expected sequence
number.
y Cell-Lost/bundle: For AAL1, cell-lost means AAL1 cell
received with wrong cell sequence number. For SAToP
and CESoPSN, cell-lost means received packets that are
discarded by SAToP and CESoP hardware machine.
y Underrun/bundle: Jitter buffer underrun means jitter
buffer is empty.
y Overrun/bundle: Jitter buffer overrun means that jitter
buffer is full and there is no room for new data to enter.
y ARP/bundle: destination doesn’t response ARP packet.
So the transmitter doesn’t know the MAC address of
destination.
y
Ethernet Link Down: Ethernet ports on the TDMoE link
down