DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Screen reference
1022Trunk Group
17
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:
The far-end switch containing the TTL may be any of the following:
■System 85 R2 switch, equipped with the Maintenance/Test Board
(TN771B)
■System 75 R1V2 and beyond, all of which contain the circuitry required to
perform the TTL function
Valid entries Usage
105-w-rl 105 with return loss
105-wo-rl 105 without return loss
high-lts high-level tone source
low-lts low-level tone source
100 100 type
102 102 type
Type TTL Description Example
105-w-rl Full range of 18
measurements or some
defaults for return loss used
(56A)
TN771B, ZLC12 and
SN261B circuit packs
and new 56A
mini-responder
105-wo-rl Cannot return default values
for far-end return loss Older 56A
mini-responder
high-level-tone Sends a fixed sequence of
tones at 0 dBm ZLC12 and SN261B
circuit packs
low-level-tone Sends a fixed sequence of
tones at -16dBm SN261B circuit pack
100 Up to 5 measurements that
sends a 1004 Hz tone then a
quiet termination
102 One measurement that sends
a 1004 Hz tone