Lucent Technologies 7820-0802-003 Outgoing continuity tests on T1 and T3, Element Description

Signaling System 7 (SS7)

Configuring an SS7 signaling gateway

TAOS also supports the 4-wire-to-2-wire continuity check, with the following requirements: The exchange that terminates 4 wires must use a transmitting frequency of 1780 ± 20Hz and a receiving frequency 2010 ± 30Hz. The exchange that terminates the 2 wires must use a transmitting frequency of 2010 ± 8Hz and a receiving frequency of 1780 ± 30Hz.

Outgoing continuity tests on T1 and T3

TAOS units support incoming continuity tests on both T1 and E1 lines. During these tests, the telephone switch requests that the TAOS unit put a DS0 channel into a loopback and then generates a 2010Hz tone. If the switch receives the tone in return, the continuity test is successful.

TAOS also supports outgoing call continuity tests on T1 and T3 cards. For outgoing continuity, the switch puts a DS0 into a loopback and the TAOS unit generates a 2010Hz tone. If the TAOS unit receives the tone in return, the continuity test is successful. Note that all the setup and signaling required to coordinate a continuity test is handled by the signaling gateway via SS7.

Note: Outgoing continuity tests are supported only on T1 and T3 cards. E1 cards support receipt of 4-wire continuity check requests only, and cannot originate continuity tests.

Digital milliwatt tone support on T1 and T3

T1 and T3 cards generate the 1000Hz digital milliwatt (DMW) tone. The SS7 switch sends a digital milliwatt tone request to the TAOS unit over IPDC and uses the tone that the TAOS unit generates in special test calls to measure the line distortion and attenuation in the telephone network.

Analog milliwatt tone and variable tone support

IPDC Tone-Type and Tone-Sting tags enable the IPDC Specify Tone (STN) message to generate the analog milliwatt tones. When the TAOS unit receives a message from the signaling gateway specifying these tags, it responds with the appropriate tone type or tone string. When the signaling gateway specifies a variable tone, it details the tone in the IPDC Tone-String message tag, which uses the following format:

"frequency1, frequency2, amplitude, duration"

Element	Description
Frequency1	First frequency of the dual tone. This value can range from 1 to
	3999 and has an accuracy of ± 1Hz.
Frequency2	The second frequency of the dual tone. This value can range from
	0 for single tones to 3999 and has an accuracy of ± 1Hz.
Amplitude	Amplitude of the tone. If this value is in the range of 4 through
	32767, it is an absolute value. A value in the range from -49
	through 2 is a decibel level. The following relationship exists
	between decibel levels and absolute values:
	dBm0 = 20 * log10 (absolute value / 22748.4)

APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide 18-13