Black Box MWU2000-X21 - Manual (Page 93)

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2.048Mbps Wireless Modem
TECHNICAL: 0118 931 2233
4. Verify that the following parameters are the same in both units:
• Hopping Standard and Hopping Sequence
• Clock Rate and Modem Rate
5. Check that the number of links to synchronize parameter is greater or equal to the number
of connected units.
Problem 9: The fractional E1/T1 link is synchronised, but one or some systems that
are connected to the end equipment (i.e. telephone, fax voicemail) is not working
properly.
Probable cause:
• Incorrect configuration of the channels selected in the modem
• Echo cancellation is activated on data/signaling channels
• Non-matching tone disabling method
• The link delay is too high
• Too many errors
If the telephone(s) does not work properly:
1. Verify that echo cancellation is not active on channel(s) carrying signalling information.
2. Check that all the relevant channels are selected in both 2.048Mbps wireless Modems.
If Fax(es) does not work properly:
1. Verify that the tone disabling method selected in the 2.048Mbps Wireless Modem matches
the capabilities of the fax equipment
2. Check the errors in the LIU link. Some fax equipment are highly sensitive to errors and too
many errors may even cause automatic disconnection. It is recommended that the LIU
BUFFER ERROR RATE will not exceed 10-5.
3. Check that the one-way delay of the link does not exceed one (1) second. If necessary, try
to decrease the delay.
If voice mail/auto-attendant/other PBX systems/features does not work properly:
1. Verify that echo cancellation does not interfere with proper operation of the relevant voice
channels. If necessary, disable echo cancellation on this channel(s)
2. Check sensitivity of the protocol used by the relevant application to the delay of the link.
Try to decrease the link delay to solve the problem