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Example 2: Wireless 802.11b/g Ethernet Bridge as in Figure 2.     
 

1. Check the physical hookup for correctness: The G1600 requires an E1/T1 cross 

cable in its connection to the E1/T1source.  A pair of 802.11b/g Wireless 
Ethernet bridge is also required for two G1600s to connect with as in Figure 2.   
A PC or dumb terminal connection to the console port must use a null modem 
(RS232) cross cable with settings of 115200, N, 8, 1. 

 

2. Check that the Ethernet configuration parameters are correct.   

Minimal

 header 

must be selected, and a large payload per packet (say 1492 bytes) is recommended.   
Also, it is recommended to select 10M/Half for 802.11b Ethernet Bridge.  
Selection of Auto-Negotiation may result in longer time for synchronization.   

 

3. It is recommended to set one G1600 as Loopback-Master and the other as 

Recovered-Slave.  If the Tx clocks on both G1600s are configured as 
Loopback-Master, make sure that the clock source driving both units is stable.   

 

4. Use an E1 tester to perform the remote loopback test. 

 
Table 5-3 lists 

performance

 observations and 

problem

 suggested causes and 

corrections for G1600. 
 

Observations  

Possible Cause  

Corrections 

 

Jitter overflow and underflow 

is occurring on both G1600s 

 

The maximum jitter setting is 

too low. 

 

Look at the ping round-trip time on the 

CES GetStatus display. This is an indication 

of the network delay. The maximum jitter 

should be at least this long. 

Wide variation between 

maximum and minimum jitter 

levels but no occurrence of 

jitter overflow or underflow 

The jitter buffer is operating 

correctly. There is variability 

in the packet network possibly 

due to congestion. 

If the minimum is close to zero or the 

maximum close to twice the maximum jitter 

setting, increase the maximum jitter setting 

to avoid future overflow or underflow.

 

 
**

 For more details about the operational theory and configuration, please read through Chap 1 and 2 

of the G1600 user manual.  Chapter 3, and 5 provide the details for CLI commands, testing and 

troubleshooting.

 

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