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61220010L2-5, Issue 3

61220010L2-5C

IDSL/DDS Trouble Code

The IDSL/DDS system provides a quick diagnosis in
the case of a circuit condition where continuity is
broken when the IDSL/DDS circuit uses ADTRAN U-
BR1TEs with DDS Loopback capability in the central
office or remote terminal.  The trouble code type
received by a tester determines whether the open
condition is occurring on the local loop or at the
customer premises.  In the event of a 2-wire DSL loss
of signal, loss of sync, or open condition caused by an
open conductor or disconnected 2-wire loop, the
U-BR1TE transmits a Mux-Out-of-Sync (MOS 9Ah)
trouble code into the network as shown in 

Figure 4

.

During a similar out-of-service condition at the
customer premises, the IDSL OCU-R transmits
Abnormal Station Code (ASC 9Eh) upstream into the
network as shown in Figure 4.

Remote End Initiated LBK Tests

The U-BR1TE supports loopbacks generated from the
IDSL OCU-R which allow testing to be performed
without coordination with the CO or test center.
Loopbacks initiated by the IDSL OCU-R front panel
LBK pushbutton (SW2) aid in system turn-up testing
or troubleshooting from the remote end.

The U-BR1TE responds to a loopback command
initiated at the IDSL OCU-R as follows:

Pressing the LBK pushbutton on the OCU-R once
will initiate a loopback at the U-BR1TE towards
the customer.  See 

Figure 6

.  This allows data to

be sent from the remote end to test the local loop
and the IDSL OCU-R.  This loopback is indicated
by a flashing CUST LBK LED on the IDSL
OCU-R and a flashing TEST LED (D4) on the
U-BR1TE.

Pressing the OCU-R LBK pushbutton a second
time initiates a loopback at the IDSL OCU-R
towards the 4-wire DDS (CPE) interface. A solid
CUST LBK on the IDSL OCU-R indicates a
loopback at the IDSL OCU-R towards the
customer equipment.
See 

Figure 7

.

Pressing the OCU-R LBK pushbutton a third time
disables all current loopbacks initiated by the
OCU-R LBK pushbutton.

If errors exist the loopbacks can help determine the
source; either the local loop or the IDSL OCU-R.
During a remote end initiated loopback the IDSL/DDS
system transmits ASC 9Eh towards the network,
indicating an out-of-service condition generated by
the remote end, as shown in Figures 6 and 7.

All latching loopbacks, whether initiated by the craft
interface, LBK pushbutton, CO, or from a remote test
center, can be released by sending 35 DDS loop down
TIP bytes <X0111010> (where X is a “don’t care” bit).

Loopback LED Operation

IDSL OCU-R loopback status is indicated via the
faceplate NTWK LBK and CUST LBK LEDs.  An
active loopback occurring at the unit being viewed is
always indicated via a solid loopback LED. A flashing
loopback LED indicates a loopback condition at the
far end unit.  When a loopback towards the network is
initiated, the NTWK LBK LED on the faceplate of the
IDSL OCU-R is illuminated.  A loopback generated
towards the customer illuminates the CUST LBK LED.

ADTRAN U-BR1TE Bidirectional Loopback

The ADTRAN U-BR1TE will execute a bidirectional
loopback when performing DS0 DP loopbacks.  Refer to

Figure 5

 for an illustration of the bidirectional loopback.

Figure 4.  IDSL/DDS Trouble Codes

Figure 5. ADTRAN U-BR1TE Bidirectional

Loopback

Test

Set

IDSL OCU-R

ADTRAN 

U-BR1TE

Bidirectional 

loopback

MOS 9Ah

Channel Bank

Open 2-wire Loop

DSU

OCU-R

U

B

R

1

T

E

Customer Premises

ASC 9Eh

Channel Bank

ASC 9Eh

Open 4-Wire Customer

Interface

DSU

OCU-R

Customer Premises

U

B

R

1

T

E

Summary of Contents for T200 IDSL

Page 1: ...S Trouble Codes 6 Figure 5 ADTRAN U BR1TE Bidirectional Loopback 6 Figure 6 IDSL DDS Remote End Initiated Loopback Local Loop 7 Figure 7 IDSL DDS Remote End Initiated Loopback Customer Loop 7 Figure 8...

Page 2: ...ar channel capability LED indicators for operational status T200 mechanics Transmits Abnormal Station Code upstream during out of service 4 wire customer loop condition Figure 2 IDSL DDS Circuit Diagr...

Page 3: ...ll permit the IDSL OCU R to respond to the legacy latching loopback sequence per TR62310 and ANSI T1 417 At 64 kbps with LLEN OFF the IDSL OCU R enables ADTRAN s Protected Loopback Protected Loopback...

Page 4: ...customer port is classified as suitable for connection to intra building or non exposed wiring only r i a P p i r t S l a n i m r e T s n o i t a n g i s e D s n o i t a n g i s e D s n o i t a n g i...

Page 5: ...i b r o f t s e t k c a b p o o l r a e l C f o s e t y b e v i t u c e s n o c r u o F e d o c k c a b p o o l d e i f i c e p s U C O 0 1 0 1 0 1 0 X U S C 0 0 0 1 0 1 0 X U S D 0 0 1 1 0 1 0 X h t...

Page 6: ...ime initiates a loopback at the IDSL OCU R towards the 4 wire DDS CPE interface A solid CUST LBK on the IDSL OCU R indicates a loopback at the IDSL OCU R towards the customer equipment See Figure 7 Pr...

Page 7: ...capability disable all power saving programs Otherwise communication between the PC and the IDSL OCU R unit can be disrupted resulting in misplaced characters or screen timeouts Operation The T200 ID...

Page 8: ...ation INV Invalid Frame Relay Frame O O Any frame with a CRC error O O Any frame containing fewer than five octets O O Any frame containing more than 8191 octets O O Any frame that does not contain an...

Page 9: ...ure 9 Main Menu Screen CIRCUIT ID IDSL Test Unit 07 25 00 02 14 40 Adtran IDSL Main Menu 1 Status 2 Loopbacks 3 Performance Monitoring 4 Event Log 5 Set Circuit ID 6 Set Date and Time 7 Adtran Informa...

Page 10: ..._______ ____________ UBR1TE OCU R NETWORK 000 000 CUSTOMER MARGIN 20 ATTEN 00dB ____________ ____________ 1 Legend 2 Detailed Status Selection Figure 12 IDSL Detailed Status Screen CIRCUIT ID IDSL Tes...

Page 11: ...for the last 25 hours At each 24 hour interval the performance data is transferred into the 24 hour performance data register also accessed using this screen The Performance Monitoring screens are sh...

Page 12: ...0000 01 45 000 000 00000 01 45 000 000 00000 000 000 00000 01 30 000 000 00000 01 30 000 000 00000 000 000 00000 01 15 000 000 00000 01 15 000 000 00000 000 000 00000 01 00 000 000 00000 01 00 000 000...

Page 13: ...00000 00000 00000 000 00 45 00000 00000 00000 00000 000 00 30 00000 00000 00000 00000 000 00 30 00000 00000 00000 00000 000 00 15 00000 00000 00000 00000 000 00 15 00000 00000 00000 00000 000 00 00 0...

Page 14: ...to virtually a 0 BER Figure 19 Event Log Screen The Set Circuit ID screen Figure 20 sets the circuit identification Figure 20 Set Circuit ID Screen CIRCUIT ID IDSL Test Unit 07 25 00 02 38 13 EVENT L...

Page 15: ...the IDSL OCU R Figure 22 ADTRAN Information Screen CIRCUIT ID IDSL Test Unit 07 25 00 02 39 32 Support Hours 7am 7pm CST Emergency 7days x 24hrs Phone 800 726 8663 Fax 256 963 6217 Internet www adtran...

Page 16: ...ablishment and remains ON after the IDSL OCU R has been remotely provisioned If the IDSL OCU R has been remotely provisioned the operator can alternate between remote configuration and manual switch s...

Page 17: ...bility 800 827 0807 ADTRAN Technical Support Pre sales Applications Post sales Technical Assistance 800 726 8663 Standard hours Monday Friday 7 a m 7 p m CST Emergency hours 7 days week 24 hours day A...

Page 18: ...18 61220010L2 5 Issue 3 61220010L2 5C...

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