Procedure 11.22: VERIFY OPERATION OF ALD1 CIRCUIT PACK(S)
14A
ANNOUNCEMENT SYSTEM
OVERVIEW
This procedure verifies the channel output transmission level, if the
recommended
Bellcore Technical Advisory
standard is being used, and/or the audio quality of the announcement(s) of the 14A announcement system ALD1
circuit pack(s). (See 201-521-101 for additional information on the 14A announcement system.)
PROCEDURE
1.
Notify office supervision that selected ALD1 circuit pack will be removed from service.
2.
NOTE:
The following test (Steps 3 through 8) uses the Bellcore Technical Advisory standard
transmission level to the network of -24 dBm for special information tones (SITs) and -22 VU for the
announcement message. This test is
invalid
if using nonstandard SIT and announcement values.
Is the Bellcore Technical Advisory standard for SITs and announcement messages being used for this ALD1
pack?
If
YES
, continue with next Step.
If
NO
, go to Step 13.
3.
At rear panel of selected ALD1 circuit pack, connect the transmission measuring set (TMS) to pins
20(T)
and
50(R)
on the
940A
connector.
4.
Verify the TMS is set for the proper trunk circuit impedance, 600-ohm position for 600-ohm trunks or
900-ohm position for 900-ohm trunks.
5.
On the front panel of the ALD1 pack (Figure 11.22-1 ), depress the
SET LEVEL/NORMAL
LED pushbutton
switch.
Response:
SET LEVEL/NORMAL
LED lights.
Selected channel is removed from service.
A steady 1000-Hz reference tone is generated by the ALD1 for detection by the TMS.
The TMS indicates the output transmission level of the selected ALD1 pack.
6.
Read the output transmission level on the TMS and compare with the applicable value in Table 11.22-1 .
7.
Disconnect TMS when measurement is completed.
8.
NOTE:
The values in Table 11.22-1 will result in meeting the Bellcore Technical Advisory
standard transmission level to the network of -24 dBm for special information tones (SITs) and -22
VU for the announcements. These values assume a 6 dB loss between the
T
and
R
outputs of the
14A and the input of the trunk circuit. If the loss is less, the values must be decreased accordingly. If
the 14A is connected to a 2-wire telephone line instead of a trunk circuit, as in a remote switching
module (RSM) application, the
T
and
R
outputs are connected to the 2-wire line via the AWH1 circuit
pack. For this type of connection, the preferred output transmission level shown in Table 11.22-1
should always be used.
Is the TMS measurement the same as the applicable value in Table 11.22-1 ?
235-105-210
October 1999
Copyright © 1999
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