Installation guide

SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
115 Revision: 2002-09-10
13.2 Hints for Troubleshooting
13.2.1 Problems
Problem To do:
No response from the modem • Please check your physical serial connection.
• Does the PC/cable combination work on other modems?
• Is it the correct cable (see manual section "Cables")?
• Is the cable grounding correctly connected (floating ground)?
Check cable.
• Please check your baud rate, COM1, COM2, etc configuration
on the PC (see chapter "Monitor").
• Try typing <Control-Q> which is XON and <ECHO>, (to re-
enable communication to LTUs occasionally left in XOFF state)
• Try selecting the modem using <%n>, n being modem
address. (See chapter "Monitor").
Strange signs are received in
response from the modem.
• Check baud rate of PC
• Try typing <Control-Q> which is X-on and <ECHO>
Problems with E1 clock (frequency,
drift, slips):
• Check configuration: Do not configure the E1 interfaces at both
ends to use the receive clock as transmit clock except if one
DSL equipment is an LTU using the “External Clock” option.
Otherwise there will be no defined clock.
No startup • If both system units are configured as master or as slave, no
start-up will occur. To identify the master unit, check if both
LED’s are lit ‚ON‘ The slave has only the local LED turned on.
• Check that you use twisted pair cables till to the end of DSL
RJ-45 connector. Do not use other cable types as twisted
pairs.