Verilink Productivity 500 (34-00236) Product Manual - Manual (Page 59)

Call Placement 500 TA Page 59
B-Channel Speed
The B-channel speed of the true end-to-end ISDN connection is 64 kbps. How-
ever, if a call is routed outside of the ISDN network, the B-channel speed may
be reduced to 56 kbps. The answering TA will automatically adjust to the B-
Channel speed of the incoming call.
Data Path Compatibility
In some instances it may not be possible for the 500 TA to make a successful
data call from one location to another because a compatible data path does not
exist between the calling and called unit networks. In this case, the originate
mode command (%A98) can be used to force the network to treat data calls as
if they were speech or audio calls. Data calls placed and answered as speech or
audio calls have an ISDN B-channel speed of 56 kbps regardless of the unit's
link speed setting. This allows the 500 TA to make a data call even if there is no
true end-to-end ISDN 64 kbps data path.
Echo Canceling
To eliminate echoes, the network may route calls through an echo canceller.
The echo canceller disrupts data calls and can cause the calling TA to fail to
connect with the called unit. In these cases, the user should turn the Disable
Echo Tone ON using the %A96 command. With this option selected, the 500
TA sends a tone at the beginning of the data call to disable the echo canceller.
DIALING D
The D command causes the 500 TA to dial a number. For example, to dial the
number 555-1212 enter:
AT D 555-1212
Use spaces, hyphens, parentheses, or other punctuation (except dial modifiers)
to make the command line easier to read and enter. For example, the following
are all treated as the same command:
AT D 1-800-555-1212
AT D 1 (800) 555-1212
ATD1800551212
NOTE: Except for the semicolon modifier, standard dial modifiers are ignored
by the 500 TA.