ADTRAN T200 IDSL Instrukcja Użytkownika Pobierz pdf (Strona 9)

61292023L5-5A Issue 1, May 2004 9

If errors exist the loopbacks can help determine the

source; either the local loop or the Total Reach OCU-R.

During a remote end initiated loopback the Total Reach

system transmits ASC 9Eh towards the network,

indicating an out-of-service condition generated by the

remote end, as shown in Figure 9 and Figure 10.

All Total Reach system latching loopbacks, whether

initiated by the craft interface, LBK push-button, CO, or

from a remote Test Center, may be disabled by sending

35 DDS loop down TIP bytes <X0111010> (Where “X”

is a “don’t care bit”). All existing latching loopbacks

may also be disabled by pressing the LBK pushbutton

on the CO or remote units.

4. CONTROL PORT OPERATION

The Total Reach OCU-R provides a front panel DB-9

connector that supplies an RS-232 interface for

connection to a controlling terminal. The pinout of the

DB-9 is illustrated in Figure 11.

Figure 11. DB-9 Cable Side Pin Assignments

The terminal interface operates at data rates from 1.2

kbps to 19.2 kbps. The asynchronous data format is

fixed at 8 data bits, no parity, and 1 stop bit. The

supported terminal type is VT100 or compatible.

NOTE

When conducting a Terminal Session, always

select VT100 mode in the settings menu prior

to making the craft connection.

NOTE

If using a personal computer with terminal

emulation capability, disable all power saving

programs. Otherwise, communication between

the PC and the Total Reach OCU-R may be

disrupted, resulting in misplaced characters or

screen time outs.

Operation

The Total Reach OCU-R is ready for synchronization

and operation upon insertion in the shelf or housing.

When synchronized, terminal sessions provide access to

screen menus for provisioning, monitoring, testing, or

obtaining performance history. Terminal session

screen access is available at any time during operation.

The screens shown in this practice identify the main

menu screens; subordinate screens are not depicted.

Abbreviations

Abbreviations used in the screen diagrams are

explained below:

• ES (Errored Seconds): A count of the number of

seconds in which at least one code violation was

detected on a digital circuit.

– Total Reach Interface (DSL): Second in which a

CRC error occurs

– Customer DDS Interface: Second in which an il-

legal bipolar violation occurs

• UAS (Unavailable Seconds): A count of the

number of seconds that a circuit or path is not avail-

able.

– Total Reach Interface (DSL): Will accumulate

upon the loss of loop synchronization or the oc-

currence of 7 errored seconds in a period of 20

seconds. UAS will stop accumulating upon the

occurrence of 30 consecutive non-Errored Sec-

onds

– DDS Customer Interface: Will accumulate upon

the loss of sealing current (LOOP OPEN), loss of

receive signal (LOS), loss of secondary channel

framing (LOF), or when the illegal bipolar viola-

tion error rate is >1E-3 for at least 10 seconds.

UAS will stop accumulating upon the occurrence

of 10 consecutive non-Severely Errored Seconds

• BPV (Illegal Bipolar Violation)

– DDS Customer Interface: Two consecutive puls-

es of the same polarity or violation received that

does not alternate in polarity with respect to the

prior violation

• INV (Invalid Frame Relay Frame)

– Any frame with a CRC error

– Any frame containing fewer than five octets

– Any frame containing more than 8191 octets

– Any frame that does not contain an integral num-

ber of octets

– Any frame containing a frame abort

TXD (Transmit Data)

RXD (Receive Data)

SGN (Signal Ground)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 21 22

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