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acrcAchieved cyclic redundancy check mode
(Only used if CRC=3, automatic detection of the remote end's CRC-4 mode.)
0
Undefined, achieved CRC mode not yet settled
1
CRC to CRC co-operating
2
CRC to non-CRC co-operating
circsupCircuit supervision
Turns circuit supervision on or off when parameter MODE is used.
0
Circuit supervision is off
1
Circuit supervision is on
crcCyclic redundancy check
(Only used with 32-channel ETC or ETB without Echo Canceller.)
CRC is only available for certain ETC and ETB hardware. (See each value of the CRC parameter.)
0
No cyclic redundancy check. Only Frame Alignment Signal word violations are counted as bitfaults.
1
Cyclic Redundancy Check (CRC-4) is used to check the incoming Pulse Code Modulation (PCM) bitstream, and no E-bits will be sent to the remote end. The remote end must have the same type of check. Only applicable for trunk DIP's. (Only used with 32-channel ETC or ETB without Echo Canceller.)
2
CRC-4 is performed on both outgoing and incoming PCM bitstream, and E-bits will be sent to the remote end. The remote end must have the same type of supervision.
3
Automatic detection of the remote end's CRC-4 mode. If CRC-4 multiframe alignment is achieved the DIP will perform CRC-4 processing on both incoming and outgoing bitstream, as for CRC=2. If no CRC-4 multiframe alignment is achieved, the following consequent actions apply: - Inhibition of CRC-4 processing on the incoming data stream. - Transmission of CRC-4 data to the remote end with both E-bits set to zero.
dipDigital path name
epdEnd path delay
(Only used with Echo Canceller connected to the trunk.) Specifies the time period which the Echo Canceller Device (ECD) stores the samples for comparison with the outgoing samples. The time depends on the distance from the ECD to the "fork" and on the type of cable used. Depending on the desired resolution the different times are:
0
16 ms
1
32 ms
2
48 ms
3
64 ms
frsFrame structure
(Only used with 24 channel ETC/ETB.) This parameter specifies what type of multiframe structure is used.
0
12 frames per multiframe
1
24 frames per multiframe, as per recommendation ITU-T G.704 and ANSI T1.403. The CRC-6 Message Block (CMB) is multiplied by x**6 and divided by generator polynomial x**6 + x + 1. F-bits in CMB are substituted by 1's. Restricted Digital Information (RDI) sequence of 8 1's and 8 0's.
2
24 frames per multiframe, as per recommendation TTC JT-G704. The CRC-6 Message Block (CMB) is divided by generator polynomial x**6 + x + 1. Substitution of F-bits in CMB, and multiplication of the CMB are not performed. RDI sequence of 16 1's.
The same frame structure must be used at both ends of the PCM link.
hlcHigh level compensation
This parameter specifies if high levels are going to be attenuated or not.
(Only used with Echo Canceller connected to the trunk.)
0
Deactivated
1
Activated
inactInhibited actions at excessive error rate or consecutive severely errored second
0
No inhibition (AIS/ALL1 will be sent towards Group Switch (GS).)
1
Inhibition of AIS/ALL1 towards GS (The incoming bit stream will be sent towards GS.)
lcLine code
This parameter specifies what type of line code is to be used.
(Only used at 24-channel ETC.)
0
Alternate Mark Inversion (AMI) / Zero Code Suppression
1
Binary 8 Zero Substitution (B8ZS)
NOTE: The additional information is available in Application Information for relevant DIPST block.
modeSpecifies in which mode the ETC is working
(Only used for Common Channel signalling Subsystem (CCS), when timeslot 16 for 32 channel PCM or timeslot 9 for 24 channel PCM is used as a 64 kbit/s connection.)
For 32 channel PCM is:
0
Timeslot 16 towards GS
1
Timeslot 16 as a single 64 kbit/s channel that can be extracted from ETC. (For example towards an STC.)
For 24 channel PCM is:
0
Timeslot 9 towards GS
1
Timeslot 9 as a single 64 kbit/s channel that can be extracted from ETC. (For example towards an STC.)
NOTE: For 24 channels PCM, the timeslot may be selectable. See parameter STC.
multfsMultiframe structure
Specifies if multiframe structure shall be supplied for this DIP.
(Only used for CCS.)
00
No multiframe supervision
01
Multiframe supervision (The ETC will work as it does for Channel Associated Signalling (CAS)).
11
Multiframe supervision and circuit supervision (at satellite connections).
When use of Digital Circuit Multiplication Equipment (DCME) or external Echo Canceller (EC) the MULTFS should be set to 01.
When use of DCME without CRS, or external Echo Canceller (EC: using bit C in time slot 16), MULTFS must be set to 01 or 11.
Table 1 Possible Parameter Values External ECCircuit Supervision DCME DCME w/CRS MULTFS
00
X 01
X01
X 01
XX 01
XX01
X11
X X11
X X11
X X X11
nlpNon linear processor
(Only used with Echo Canceller connected to the trunk.) To ensure that the send-out signal is completely free from echo. The NLP can replace the residual echo with a digital null signal. The speech signals are left intact and only residual echo is deleted when NLP is operating.
XX0
Off, canceller only
X01
Off during doubletalk, CCITT
X11
On, continuously
0X1
Hard, null signal all residual echo is removed.
1X1
Soft, partial attenuation
With X means that either 0 or 1 can be used.
prmTransmission of Performance Report (PCM)
Messages on the 4 kbit/s datalink as according to recommendation ANSI T1.403. (Only for 24 channel ETC/ETB operated in 24 frames for each multiframe mode. See parameter FRS.)
0
No transmission
1
Transmission
Must be set in cooperation with the remote end of the PCM link.
qsupQuality supervision
Specifies the way the quality supervision is to be evaluated.
0
Quality is evaluated using the supervision functions BFF, DF and SF only.
1
Quality is evaluated using the supervision functions ES, SES and DM, with threshold limits ESL, SESL and DML.
See also command DTQSC.
2
Quality is evaluated using the supervision functions ES, SES and DM (if used), each with an associated unacceptable and degraded performance level. The respective levels for unacceptable performance are ESL, RESL, SESL and DML. For degraded performance, the respective levels are ESL2, SESL2 and DML2.
See also command DTQSC.
3
Quality is evaluated using the supervision functions ES and SES, each with an associated unacceptable and degraded performance level. The respective levels for unacceptable performance are ESL, RESL, SESL and RSESL. For degraded performance, the respective levels are ESL2 and SESL2. In addition the supervision function SF with threshold limit SFL is used.
See also command DTQSC.
reftrRemote frame transmission reception
Specifies in which way the alarm indication to the remote end shall be transmitted/received.
(Only used in 24 channel ETC.)
12 frames for each multiframe:
0
Bit 2 in every timeslot is set to 0.
1
Bit 2 in every timeslot is set to 0 (concerning channel information) and S-bit in frame 12 is set to 1 (concerning signalling information). (Only valid for CAS.)
24 frames for each multiframe:
0
Bit 2 in every timeslot is set to 0 and a pattern of zeros/ones is sent on the 4 kbit/s datalink.
1
A pattern of zeros/ones is sent on the 4 kbit/s datalink.
sbitsSpare bits
It is used to set bits in TS0 (Sa4-Sa8) and in TS16 (Sm1-Sm3) (TS=timeslot). The SBITS is specified as a binary number with binary digits for fixed bits and as "X" for bits used by specific function. The format is as follows: Sa8 Sa7 Sa6 Sa5 Sa4 Sm3 Sm2 Sm1.
Sm3, Sm2 and Sm1 can be omitted.
Note: If parameter SEC=YES then bits Sa5 and Sa6 cannot be set.
secSectionalized supervision supported
YES
Sectionalized supervision option is supported.
NO
Sectionalized supervision option is not supported.
Note: Sectionalized supervision is supported only if CRC-4 mode is selected. (Parameter CRC=2 or parameter CRC=3 with ACRC=1).
stcTimeslot for connection of STC
This parameter is only used for 24 channel ETC/ETB. The contents of the specified 64 kbit/s channel will be extracted from the ETC, and not connected towards group switch. See also parameter MODE.
[ 本帖最后由 namipan 于 2014-3-28 16:25 编辑 ]
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