NEC Neax2000 Ivs Isdn System Manual

							ND-45857 (E) CHAPTER 5
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(2) When providing two clock supply routes (from a master office and a sub-master office)
STEP 7: On the DTI cards extracting clock signals (DTI0, DTI1), set the SW-1 and SW-2 as follows to change
the clock supply route from 0 (from a master office) to 1 (from a sub-master office).
DTI0 card: SW-1 to OFF, SW-2 to OFF
DTI1 card: SW-1 to OFF, SW-2 to ON
STEP 8: Originate an outgoing call via DTI.
STEP 9: After an outgoing connection via DTI has been established, confirm interoffice synchronization and
speech quality with the following procedure.
On the DTMF telephone set, keep pressing any dial button.
Check to see if noise is periodically occurring with the DTMF signals
coming from the calling station in the opposite office.
Perform the above test again in the opposite direction.
STEP 10: On the DTI cards (DTI0, DTI1), set the SW-1 and SW-2 to “OFF” to stop the external clock signal
input.
– The CLKIN lamp on the MP card goes out.
STEP 11: Perform the procedure shown in STEP 2 and STEP 3 again.
STEP 12: On the DTI cards (DTI0, DTI1), set the SW-1 and SW-2 as shown in STEP 1 to input clock signals
from the clock supply route 1.
STEP 13: Perform the procedure shown in STEP 2 and STEP 3 again.
STEP 14: On the DTI cards (DTI0, DTI1), set the SW-1 and SW-2 as follows to change the clock supply route
from 1 to 0.
DTI0 card: SW-1 to ON, SW-2 to OFF
DTI1 card: SW-1 to OFF, SW-2 to ON
– The CLKIN lamp on the MP card lights.
STEP 15: Perform the procedure shown in STEP 2 and STEP 3 again.
If noise is periodically occurring, replace the MP card after checking the switch settings on the MP card,
and perform the above test again.
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3.2.3 Interoffice Synchronization Test
This test checks to see if noise is occurring while calling with the opposite office, by difference of the clock
signal frequency between the offices.
To perform this test, an “In Service” transmission line is required.
STEP 1: Originate an outgoing call via DTI.
STEP 2: Check the speech quality (if noise, distortion or click is occurring during a few minutes) with the op-
posite office mutually.
STEP 3: On the DTMF telephone set, keep pressing any dial button, and check to see if noise is periodically
occurring with the DTMF signals coming from the calling station in the opposite office.
STEP 4: Perform the above test again in the opposite direction.
If noise is periodically occurring, replace the MP card after checking the switch settings on the MP card,
and perform the above test again. 
						

							ND-45857 (E) CHAPTER 5
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3.2.4 Master Office Mode Test
When the PBX is operated as a master office using the PN-CK00, perform this test.
To perform this test, an “In Service” transmission line is required.
STEP 1: Confirm that the SW-1 and SW-2 on all the DTI cards mounted in PIM0 are set to “OFF”.
STEP 2: Confirm indication lamps on the PN-CK00 card.
STEP 3: Originate an outgoing call via DTI.
STEP 4: After an outgoing connection via DTI has been established, confirm interoffice synchronization and
speech quality with the following procedure.
On the DTMF telephone set, keep pressing any dial button.
Check to see if noise is periodically occurring with the DTMF signals
coming from the calling station in the opposite office.
Perform the above test again in the opposite direction. When the SYNC lamp lights, the clock signal is not generated from the PN-CK00 card. Check the switch
settings on the DTI, PN-CK00 and MP card.
For details of the lamp indications, refer to the Circuit Card Manual.
If noise is periodically occurring, replace the PN-CK00 card after checking the switch settings on the PN-
CK00, DTI and MP card. If noise have not been cleared, replace the MP card and perform the above test
again.
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