Avaya Communication Manager Administrator's Manual page 1670

Screen Reference
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.
Valid entries
105-w-rl
105-wo-rl
high-lts
low-lts
100
102
The following table explains the differences between types of terminating test lines:
Type TTL
105-w-rl
105-wo-rl
high-level-tone
low-level-tone
100
102
The far-end server or switch containing the TTL might 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
System 85 R2 switch, equipped with the Analog/Digital Facility Test Circuit (ADFTC,
●
SN261)
1670 Administrator Guide for Avaya Communication Manager
Usage
105 with return loss
105 without return loss
high-level tone source
low-level tone source
100 type
102 type
Description
Full range of 18 measurements or some defaults
for return loss used (56A)
Cannot return default values for far-end return
loss
Sends a fixed sequence of tones at 0 dBm
Sends a fixed sequence of tones at -16dBm
Up to 5 measurements that sends a 1004 Hz
tone then a quiet termination
One measurement that sends a 1004 Hz tone
Example
TN771B, ZLC12 and
SN261B circuit packs
and new 56A
mini-responder
Older 56A
mini-responder
ZLC12 and SN261B
circuit packs
SN261B circuit pack