background image

4

61433105L2-5D

Section 61433105L2, Issue 4

Figure 4.  DS0 Bidirectional Loopback

Series 5 

TR

DDS-DP

DS0

Bidirectional 

loopback

Customer

Intra-office

DS0 DP units. The Total Reach DDS-DP only responds
to latching DS0 DP loopback sequences.

NOTE

If 64 kbps is selected, the unit will only respond
to latching loopback sequences.  Alternating
sequences are not valid at this rate.

Total Reach DDS-DP Bidirectional Loopback
Support

The Series 5 Total Reach DDS-DP will execute a
bidirectional loopback when performing a DS0 loopback,
as shown in 

Figure 4

.  This allows a standard portable

DDS test set, connected to the 4-wire customer
interface of the Total Reach DDS-R, to verify the integrity
of the 2-wire loop by transmitting a test pattern and
examining the returning data for synchronization and
errors.  The Series 5 Total Reach DDS-DP LBK
indicator will illuminate during this test mode.

The Series 5 Total Reach DDS-DP also responds to a
loopback command sent by the Total Reach DDS-R
when the LBK button on the Total Reach DDR-R is
pressed.  This allows loop testing to be performed from
the remote end without test center coordination.  The
SLC Series 5 Total Reach DDS-DP only performs a
loopback towards the customer in this case. The latching
and alternating loopback sequences are defined in 

Table

3

 and 

Table 4

.

Total Reach DDS Trouble Code

The Total Reach DDS system is designed to provide a
quick diagnosis in the case of a circuit condition
where continuity is broken.  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 an open conductor
or disconnected 2-wire loop, the Total Reach DDS-DP
transmits an alternating ASC/MOS trouble code into
the network as shown in 

Figure 5

.  In the event of a

4-wire open or disconnect, the TR DDS-R sends an
ASC to the network as seen in Figure 5.

Remote End Initiated LBK Tests

The Total Reach DDS-DP supports loopbacks
generated from the TROCU-R which allow testing to
be performed without coordination with the CO or test
center.  Loopbacks initiated by the TROCU-R front
panel LBK pushbutton aid in system turn-up testing or
troubleshooting from the remote end.

Table 2. LED Indication

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Summary of Contents for DDS-DP

Page 1: ...with the Total Reach DDS R termination unit the Series 5 Total Reach DDS DP can accommodate extended loop lengths eliminating the need for DDS repeaters The Series 5 Total Reach DDS DP span powers the Total Reach DDS R located at the customer premises The Total Reach DDS R converts the 2 wire signal to the traditional 4 wire Alternate Mark Inversion AMI signal for presentation to the customer The ...

Page 2: ...via the CIU Error Correction When error correction is enabled the Series 5 Total Reach DDS DP provides an error detection and correction Table 1 Option Settings U C B 5 s e i r e S a i v g n i n o i s i v o r P e r a w t f o S n o i t c n u F n o i t p i r c s e D e t a R s p b k 6 5 r o 6 9 8 4 4 2 t c e l e S n o i t c e r r o C r o r r E C E t c e l e s 2 9 1 h g u o r h t 4 2 s i e t a r f I e...

Page 3: ...mplished using the same test procedures for 4 wire Zero Code When Zero Code is enabled the Series 5 Total Reach DDS DP allows DS0 bytes of all zeros to enter the T carrier data stream On Alternate Mark Inversion AMI facilities this function should be disabled B8ZS carrier facilities that accommodate 64 kbps clear channel operation do not require the zero code to be suppressed therefore zero code i...

Page 4: ...loopbacks generated from the TROCU R which allow testing to be performed without coordination with the CO or test center Loopbacks initiated by the TROCU R front panel LBK pushbutton aid in system turn up testing or troubleshooting from the remote end Table 2 LED Indication r o t a c i d n I n o i t p i r c s e D X S t n e s e r p t n e r r u c g n i l a e s o n s e t a c i d n i N O y t i u n i t...

Page 5: ... i b e r a C t n o D X Table 3 Latching Loopback Activation Sequence The TR DDS DP will respond to a loopback command initiated at the TROCU R as follows Pressing the TROCU R LBK pushbutton once will initiate a loopback at the TR DDS DP towards the customer See Figure 6 This allows data to be sent from the remote end to test the local loop and the TROCU R This loopback is indicated by a flashing C...

Page 6: ... 50 dB at 13 3 kHz 135 Ω termination the Nyquist frequency of Total Reach DDS NOTE TheREACT2001GUIsoftwareRelease 1 900 supports ANSI T1 107 1995 Remote access is accomplished using a defined set of in band DS0 byte sequences similar to the latching loopback sequence Commands issued through the test system are recognized by the individual channel unit which responds with the appropriate byte seque...

Page 7: ... 2 1 C I P e g u a G 4 2 1 7 5 2 1 2 8 9 3 1 7 1 9 4 1 F 0 P L U P e g u a G 4 2 F 0 7 P L U P e g u a G 4 2 F 0 2 1 P L U P e g u a G 4 2 0 0 9 2 1 4 2 3 4 1 8 6 2 5 1 F 0 C I P e g u a G 6 2 F 0 7 C I P e g u a G 6 2 F 0 2 1 C I P e g u a G 6 2 1 5 7 6 1 9 6 4 8 1 8 0 6 9 1 F 0 P L U P e g u a G 6 2 F 0 7 P L U P e g u a G 6 2 F 0 2 1 P L U P e g u a G 6 2 3 2 8 6 1 8 6 5 8 1 8 1 7 9 1 NOTE Meas...

Page 8: ...t Customer and Product Service CAPS prior to returning equipment to ADTRAN For service CAPS requests or further information contact one of the following numbers ADTRAN Sales Pricing and availability 800 827 0807 ADTRAN Technical Support Presales Applications Post sale Technical Assistance 800 726 8663 Standard support hours Monday Friday 7 a m 7 p m CST Emergency support 7 days week 24 hours day A...

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