Siemens INSYS Pocket ISDN-TA, Руководство по эксплуатации

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28 Operating manual Pocket ISDN-TA
3. Once the local side rejects (with a LCP ConfigNak) an AP that was alternatively
proposed by the POCKET ISDN-TA (see previous rule), the POCKET ISDN-TA falls
back to single link operation until the next connection is tried. Local and remote
side may negotiate any AP they like.
4. At the end of the link setup procedure the negotiated AP is checked and, if
supported, is used for the second link too. If the final AP is not supported the
second link is not established, the POCKET ISDN-TA falls back to single link
operation until the next connection is tried.
Note that some hosts are very strict, e.g. if PAP is proposed by the POCKET ISDN-TA
due to the lack of a locally stored password
chappwd they simply hang up the
connection without any chance to negotiate anything else. In these cases the
POCKET ISDN-TA should be configured for single link PPP operation, or,
alternatively, the
chappwd should be supplied and stored on the POCKET ISDN-TA.
4.5.2 Call Bumping
A ML-PPP connection uses both B-channels of the S bus. To accept an incoming
call (i.e. for telephony) during a ML-PPP session one B-channel has to be released.
This is called Call Bumping.
To enable Call Bumping proceed as follows:
• Activate call waiting on the S bus. It has to be activated in the ISDN switch and
is a feature of the ISDN line you ordered.
• Open the “properties” of the dial-up link you are using for ML-PPP and
“additional settings”. Input “
at**cmlp=1 ” as an additional parameter.
If there is an incoming call during a ML-PPP session the POCKET ISDN-TA will drop
one B-channel and an ISDN telephone attached to the S bus will be ringing to
accept the call.
4.5.3 Bandwidth on demand ("BOD")
Enabling this feature will cause the TA+PP2 to use the Multilink PPP protocol to
enhance the ISDN throughput using the second B channel automatically:
• if the throughput of the internet connection is higher than a definable value a
second B channel connection will be established automatically and for data
transfer used.
• if the throughput of the internet connection is lower than a definable value the
second B channel connection will be disconnected automatically.
at**bod=0 disable BOD (default)
at**bod=1 enable BOD
at**bodiv=<incrValue> Throughput level to add 2
nd
B channel connection
(in kbit/s) (default=40)
at**bodit=<incrTime> duration that bodiv has been reached to add 2
nd
b
channel (in secs) (default=30)
at**boddv=<decrValue> Throughput level to release 2
nd
B channel connection