





8.Revisions proposed to Recommendation 0.162

       Change the existing title to:

       "EQUIPMENT TO PERFORM IN SERVICE MONITORING ON 2048 KBIT/S SIGNALS"

       Change  1.1 to read:

"1.1   This specification describes an instrument for performing in-service 
error tests on 2  Mbit/s  signals  having  frame  structures  that  are  in
accordance with Recommendation G.704 [1]."

       Introduce new  1.4 and 1.5 as follows:

"1.4   The instrument is required to monitor any Cyclic  Redundancy  Check  (CRC)
Procedure signals, in accordance with Recommendation G.704 [1],  conveyed  within
the frame alignment signal, and time slot 0 (TSO) of frames  not  containing  the
frame alignment signal.

1.5    As an option the instrument may provide access  to  the  information  bits
conveyed in any selected time slot."

       Renumber existing  1.4 to "1.6 HDB3 Decoding Strategy".

       Change the references to Recommendation G.732 in  3.3.3.1 and 3.3.3.2 to 
Recommendation G.706".

       Add the following note after  3.3.3.2:

"Note - The instrument shall be able to synchronize to frames with or without CRC 
bits."

       Change the term "error rate" to: "binary error rates" in  3.3.4.1  (three
times) and in Table 1/0.62 (two times).
       Introduce the following new section 3.4 in the Recommendation:

"3.4   Cyclic redundancy check procedure

3.4.1  Where a  Cyclic  Redundancy  Check  (CRC)  procedure  in  accordance  with
Recommendation G.704 [1] is implemented within the 2 Mbit/s signal the instrument shall 
provide the features detailed in  3.4.2, 3.4.3 and 3.4.4.

3.4.2  The instrument shall indicate the presence of CRC framing bits.

3.4.3  The instrument shall have a means of indicating binary error ratios of 1 x 
10-5, 1 x 10-6 and 1 x 10-7 and shall  cause  the  appropriate  indicator  to  be
illuminated under the conditions defined.

       The indication of binary error ratios occurring in  the  received  decoded
signal and detected by means of the CRC procedure information shall comply with the 
limits given in Table 2/0.162.

                                 TABLE 2/0.162
 
ТФФФФФФФФФФФТФФФФФФФФФФФФФФФТФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФФП 
 ГBinary     Г Average       Г Probability of indication illuminating or     Г 
 Гerror ratioГ binary error  Г extinguishing within the periods stated below Г 
 Гindication Г ratio in      УФФФФФФФФФФФФФФФФФФФФФФФФФТФФФФФФФФФФФФФФФФФФФФФД
 Г           Г decoded signalГ         Illuminate      Г   Extinguish        Г 











 УФФФФФФФФФФФХФФФФФФФФФФФФФФФХФФФФФФФФФФФФФФФФФФФФФФФФФХФФФФФФФФФФФФФФФФФФФФФД
 Г           Г   1 x 10-5    Г       50% within 1s     Г    5% within 1s     Г   Г 
 1 x 10-5 Г   5 x 10-6    Г        5% within 1s     Г         -            Г    Г
       Г   1  x  10-6     Г                -          Г    95%  within  1s      Г
УФФФФФФФФФФФХФФФФФФФФФФФФФФФХФФФФФФФФФФФФФФФФФФФФФФФФФХФФФФФФФФФФФФФФФФФФФФФД
 Г           Г   1 x 10-6    Г       50% within 10s    Г    5% within 10s    Г 
 Г  1 x 10-6 Г   5 x 10-7    Г        5% within 10s    Г         -           Г
 Г           Г   1 x 10-7    Г               -         Г   95% within 10s    Г
 УФФФФФФФФФФФХФФФФФФФФФФФФФФФХФФФФФФФФФФФФФФФФФФФФФФФФФХФФФФФФФФФФФФФФФФФФФФФД 
 Г           Г   1 x 10-7    Г       50% within 100s   Г    5% within 100s   Г   Г 
 1 x 10-7 Г   5 x 10-8    Г        5% within 100s   Г         -           Г
 Г           Г   1 x 10-8    Г               -         Г   95% within 100s   Г 
 РФФФФФФФФФФФСФФФФФФФФФФФФФФФСФФФФФФФФФФФФФФФФФФФФФФФФФСФФФФФФФФФФФФФФФФФФФФФй 


3.4.4  It shall also be possible to count the sum of the  errors  indicated.  The
count capacity shall be 99 999. A separate indication shall be given if the count 
exceeds this figure."

       Renumber the existing  3.4 to "3.5 Code violation detection"

       Introduce a new  3.6 as follows:

"3.6   Performance indications

       As an option the instrument shall  be  capable  of  providing  performance
information in accordance with G.821 - Under Study".

       Renumber the existing  3.5 to "3.7 Lamp look - Lamp auto reset".
       Introduce a new  3.8 as follows:

"3.8   Time slot access

       As an option it shall be possible to access, at an external interface, the 
contents of any selected time slot, including TS16. An external interface meeting 
the requirements of a co-directional interface, as defined in Recommendation G.703 
[2], is preferred."

       Introduce a new  4.2 as follows and renumber the existing  4.2 to     "
4.3":

"4.2   References to counters and displays  being  illuminated  and  extinguished
does not imply that "light emitting" displays are essential".

       Replace the existing sections 6 and 7 by the following ones:

"6.    Alarm output signal

       As an option, an interface shall be provided to enable an external device, 
e.g. printer, to be connected to the instrument to allow recording of the  status
of the digital signal input to the instrument.

       An  interface  in  accordance  with  Recommendation  V.24/V.28,   carrying
suitably abbreviated, plain text messages in ASCII/T.50 coded format according to the 
requirements of Recommendation V.4 is preferred.

7.     Operating environment

       The electrical performance requirements shall be met when operating within 






the climatic conditions specified in Recommendation 0.3."

       Delete the existing Tables 2/0.162 and 3/0.162 from the Recommendation.  



                                 ФФФФФФФФФФФФФФФ