Avaya Communication Manager Administrator's Manual page 1611

TTL Type
Specifies the type of terminating test line (TTL) selected for testing trunks. The TTL type
determines what ATMS tests can be completed and thus which threshold values need to be
administered.
The following table explains the differences between types of terminating test lines:
Valid entries
105-w-rl
105-wo-rl
high-lts
low-lts
100
102
Type TTL Description
105-w-rl Full range of 18
measurements or some
defaults for return loss
used (56A)
105-wo-rl Cannot return default
values for far-end return
loss
high-level-ton Sends a fixed sequence
e of tones at 0 dBm
low-level-tone Sends a fixed sequence
of tones at -16dBm
100 Up to 5 measurements
that sends a 1004 Hz
tone then a quiet
termination
102 One measurement that
sends a 1004 Hz tone
Usage
105 with return loss
105 without return loss
high-level tone source
low-level tone source
100 type
102 type
Example
TN771B, ZLC12 and
SN261B circuit
packs and new 56A
mini-responder
Older 56A
mini-responder
ZLC12 and SN261B
circuit packs
SN261B circuit pack
Trunk Group
Issue 1 June 2005 1611