Toshiba Strata DK 280 Installation Manual page 636
Digital business telephone system
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- User manual (79 pages) ,
- Quick reference manual (4 pages) ,
- System administration manual (60 pages)
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NETWORWCSU
CHECK
1
LOOP
BACK
DK0517
General Notes:
l
PI and P2 to ON position (see Figure 1 l-5).
l
Unplug RDTlJ from DK280 back plane.
.
CSU or Network
Tl equipment
should receive its own transmitted
signal.
l
Indications and results depend on CSU and/or Network equipment.
Figure 11-8
Network/C&J
Tl Span Test
I
RDTU
RDTU AMPHENOL
PIN NOS.
RDTU TX OPEN
MITEL CHIP
-b
-q
1
+
MM8976B
NDTU CABLE
General Notes:
l
Put P4 (RLB) in the ON
position to perform remote
loop back test (see Figure 1 l-5).
.
RDTU transmit signal is blocked; signal received from network (CSU) is sent back to (CSU) network.
l
RDTlJ LEDs (during remote loop back) will continue
to turn OFF/ON as shown below during the test.
LEDS ON RDTU PCB
TOP LED
-+
I
CONTINUE TO
--,
CYCLE WHEN P4 IS
IN ON POSITION
Ti
T2
T3
T4
T5
I-6 T = ABOUT l/2 SECOND
0
PRIMARY SYNC
ON OR OFF, STEADY
BOTTOM LED-b
0
SECONDARY SYNC
ON OR OFF, STEADY
DK0518
l
Put P4 in the OFF position
when RLB test is complete.
IMPORTANT
!
This test only loops "data" back. If A, B, C, and D signaling
is sent by the network, it is not looped back to the network
and may appear as an error to the network tesf equipment.
These errors should be disregarded.
*
Figure 11-9
Network/CSU/RDTU
Span Test
11-12
January
1996
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