3. 32N : CM M OMU
4. 3N+1 : BSU CCSU CASU
5. 2 : ET BDCU
a) List three kinds of units that has 2N redundancy.
OMU , STU , CHU , IWCU , CM , CCM , VLRU , HLRU , ACU , CMU
b) List three kinds of units that has N+1 redundancy.
CCSU , CASU , BSU , PAU , EIRU
c) List three kinds of units that has no redundancy.
BDCU , ET , ECU , CNFC
附加信息___06 C3 00000302 0000 0000 00_____
BJG12_51190 BSU_6 SWITCH 1999-11-25 11:19:03.85
** ALARM BSU-6 1F138-00 AIF_SS
(1822) 2745 CELLULAR NETWORK CONFIGURATION ERROR
06 C3 00000302 0000 0000 00
7.OSIAS7 ,AFS ,CCS7,ETT00,ETT16,AS7
(1) OSIAS7 :
The internal PCM has not been connected to an internal circuit group to which the time slots of the terminal belong. Name of the internal circuit group of the X.25 terminal is
The circuit group OSIAS7 should contain the internal PCMs and time-slots used by digital X.25 channels. The contents of OSIAS7 is updated when then internal PCM is routed
with the WUC command.
(2) ASF :
Functions of the plug-in unit:
The multichannel signalling link terminal of the number 7 signalling system (AS7-A) fulfils the various telecommunications protocols of the Nokia network elements. The AS7-A
plug-in unit can initialise 16 common channel signalling (CCS) channels, 64 LAPD channels,
signalling for 32 PCM circuits or a digital X.25 (8...32 time-slots divided on one or multiple
channels). Interface to the serial buses is made using two 32-channel HDLC-controllers. The
AS7-A plug-in unit is based on the 486DX5 prosessor.
The AS7-A plug-in unit replaces, depending on its application, two to four AS7-U plug-in
The purpose of the Adapter for Frame Aligner (AFS-S) is to perform supervision of 32 PCM circuits based on the time slots T0.
The time slots T0 of the PCM circuits which are simultaneously received by the switching network are switched into consecutive time slots of the internal PCM circuit of the
exchange going to the AFS-S. Based on these time slots, the AFS-S performs the following
supervision of the bit error ratio in the PCM circuits,
analysis of alarm information transferred in the odd T0 time slot,
supervision of the semipermanent connections between the exchange terminals and the AFS-S plug-in unit,
supervision of slips.
(3) CCS7 : Signalling system No. 7 (SS7)
Signalling system No. 7 is an internationally standardized general purpose common channel signalling system optimized for operation in digital telecommunication networks.
Also used abbreviations are CCS7, SS7 and SS No 7.
(4) ETT00 :
ETT00 the "ET's T0 control" function
ETT16_CAS the "ET's T16-channel-specific signalling" function
Time slot 0 is always used for synchronisation and alarms. Thus it can not be used as a signalling link. Otherwise the selection of time slot used for signalling is not restricted. The only exception is the connection between MSC and BSC, where time slot 16 is used for
This is because the Transcoder between them (in NOKIA implementation at least it placed there) usually compresses the information in all other time slots except TSL 16 unless
otherwise configured. The signalling data would not be interpretable anymore after
compression by the speech-oriented algorithms of the Transcoder. It is common practice still,
even without taking regard of a Trancoder, to place the Signalling Link into time slot 16.
8 Status of a SW build ( Meaning of statuses )
Every SW build that is created by using the commands of Software Configuration Management and stored on a disk has a certain working status. The possible statuses are:
(1) BACKUP (BU)
BACKUP is the status of a SW build that is stored on a disk and normally defined as the active, running SW build. The BU build is usually also the default build, which means that when the network element starts up, the initial loading system usually loads the BU build. The BU build cannot be deleted by using the SW build management commands. Only one BU build can be stored on the disk at a time.
(2) FALLBACK (FB)
FALLBACK is the status of a SW build that is a fallback copy of the BU build. In principle, the FB build is the same as the BU build, except that its data is from the copying moment. This means that all data updated in the BU build after the copying of the FB build is missing. When the whole SW build is fallback copied (parameter FULL), that is, the BU build is copied as the FB build, the status of the old FB build automatically changes into UT. When a fallback copy is made either of all files marked DATA in the MAFILE, or only of changed files (ARCHIVE), the files are copied on top of the previous FB build.
You can make the system return to the FB build, when necessary, by using the WSD command. Use of the FB build has to be resumed when, for example, the BU build becomes corrupted.
At a time, the status of only one SW build on the disk can be FB. (3) NEW (NW)
NEW is the status of a new SW build on the disk. The NW build has been brought into the network element first to be tested and then to be deployed. At a time, the status of only one SW build on the disk can be NW.
(4) UNTITLED (UT)
UNTITLED is the status of a SW build which is stored without a name on a disk. The system can contain several SW builds whose status is UT, and they can be stored in their own directories. Usually the SW builds with the status UT are old ones (old fallback builds, for example), and they can be deleted. Note, however, that the change delivery procedure forms the updated build with UT status in the same directory as the BU build.
All the SW builds mentioned above have been created on the disk. Statuses BU, FB and NW are called the named statuses.
There can also be uncreated SW builds on the disk. The status of an uncreated SW build is:
(5) UNDEFINED (UD)
An uncreated SW build. SW builds whose status is UD can only be referred to on the basis of the directory. If there is more than one uncreated SW build in the directory, you need to give more information to specify the build. When a new uncreated SW update build is copied to the hard disk, the system automatically sets its status to be UD, because the system needs some way of defining it. The SW builds whose status is UD are only visible in
the output commands. Several SW builds on the disk can have the UD status at the same
9 : MAFILE,SOMAFI
MAFILE : Master file (Software Package Master File)
SOMAFI : Software Configuration Management File
The information of the SW builds (CD's) and their directories is in SOMAFI file.
The information of the modules belonging to the SW build (CD) is in MAFILE file.
WO-EX , SP-UP , SP-EX , TE-EX , SE-OU , SE-NH
/* IDENTIFY WORKING STATE:
BL-ALL .... ALL BLOCKED -STATES
BL-EX .. BLOCKED, EXECUTING
BL-ID .. BLOCKED, IDLE
BL-RE .. BLOCKED, RESTART
SE-ALL .... ALL SEPARATED -STATES
SE-OU .. SEPARATED, OUT OF USE
SE-NH .. SEPARATED, NO HARDWARE
SP-ALL .... ALL SPARE -STATES
SP-EX .. SPARE, EXECUTING
SP-UP .. SPARE, WARMING
SP-RE .. SPARE, RESTART
TE-ALL .... ALL TEST -STATES
TE-EX .. TEST, EXECUTING
WO-ALL .... ALL WORKING -STATES
WO-EX .. WORKING, EXECUTING
WO-RE .. WORKING, RESTART
DEFAULT IS ALL DEFINED WORKING STATES */
(1) Numbering Plan : NP
The numbering plan refers to the standardised numbering instructions described by the ITU-T. This parameter is used only when the TOA (type of address) parameter has the value GT
(Global Title). The possible values are:
This parameter indicates the numbering plan. The parameter can have the following values:
NP=1 ISDN/Telephony (Rec. E.164/E.163)
NP=3 Data (Rec. X.121)
NP=4 Telex (Rec. F.69)
NP=5 Maritime Mobile (Rec. E.210, E.211)
NP=6 Land Mobile (Rec. E.212)
NP=7 ISDN/Mobile (Rec. E.214)
The default value is 1.
(2) Parameter = Value Description
NP = E164
The result GT address follows the ITU-T recommendation E.163/E.164 (the numbering plan for international telephone service/the numbering plan for ISDN area). The result GT address
is in "international ISDN number" or "national (significant) number" form, depending on the value
of the TON parameter.
NP = E212
The result GT address follows the ITU-T recommendation E.212 (the identification plan for land mobile stations). The result GT address is in IMSI or NMSI form, depending on the value
of the TON parameter (default).
NP = E214
The result GT address follows the ITU-T recommendation E.214. The result GT address is in "Mobile Global Title" form if the value of the TON parameter is INT. The result GT address is
in "NC + MSIN" form if the value of the TON parameter is NAT.
(4) Parameter = Value Description
NP = E.164 ISDN/telephony (default)
E.212 land mobile
E.214 ISDN/mobile (5) E.164、E.212、E.214格式 :
E.164 NP=1 格式为：CC+NDC+SN ( 86 + 139 + )
MSISDN = Mobile Subscriber International ISDN Number
E.212 NP=2 格式为：MCC+MNC+MSIN ( 460 + 00 + )
IMSI = International Mobile Subscriber Identity
E.214 NP=7 格式为：CC+NDC+MSIN ( 86 + 139 + )
MSIN = Mobile Subscriber Identification Number (ten digits)
SN = Subscriber Number
The IMSI number uniquely identifies the mobile subscriber and consists of the national mobile subscriber identifier and the mobile country code. The IMSI number is described in more
details in the ITU-T Recommendation E.212.
The parameter is obligatory and its maximum length is 15 digits.
NED , Site Document , SYSTRA , NSS SYS , Commissioning and
NED -> 2.4 Maitenance Manual -> Hardware Maintenance
CLAB , SBUS , ESB20 , GSW ,CMU
OMU , CCM , CMU , CM , STU , BDCU , MFSU , M , BSU , CCSU , GSW Operation and Maintenance Unit, OMU
The OMU handles all centralized supervision, alarm and recovery functions, and the
connections towards user interface (MMI-System). The entire system software and the event
buffer for intermediate storing of alarms is stored in the OMU mass memories
Common Channel Signalling Management Unit , CCMU
The CCMU is responsible for the CCS7 (signalling system number 7) network management
functions of the MSCi. It also features the VANG-A plug-in units, which handle the voice
Cellular Management Unit, CMU
The cellular management unit controls the cellular radio network. It also controls the CDSUs
of the exchange.
Statistical Unit, STU
The statistical unit collects the performance and measurement data from the network.
Basic Data Communications Unit, BDCU
The BDCU contains communication links to the O&M network (analog/digital X.25;
LAN/Ethernet), to the Short Message Center and to the Billing Center.
Multifrequency Signalling Unit, MFSU
The MFSU handles R2 signalling, speech channel checking, conference call control functions
and receipt of dialling inputs.
Base Station Signalling Unit, BSU
The BSU handles CCS7 signalling between the MSCi and the BSCs. It also controls the PCM connections towards the Base Station Subsystem (BSS). The maximum capacity is 32
signalling links and 64 PCMs towards the BSS.
Common Channel Signalling Unit, CCSU
The CCSU handles CCS7 signalling functions for 2Mbit/s lines towards both PSTN and the
other network elements in the NSS. The CCSU also monitors the ETs allocated to the BDCU.
Group Switch 2048, GSW 2048
The GSW is the switching network of the MSCi. It is controlled by the Marker (M). The
MSCi is provided with a GSW equipped for the capacity of 2048?2048 PCMs.
( ET , MB , CM , M , VLRU , IWCU , TG )
a) ET – Exchange Terminal?
Performs electrical synchronisation and adaptation of external PCM lines.
It is able to do the HDB3 coding and decoding, inserts the alarm bits in the
outgoing direction and produces the PCM frame structure.
b) MB – Message Bus?
Message Bus is physical connection between the computer units. It is
controlled by the message bus interfaces located in every computer unit.
c) CM – Centrol Memory?
Central Memory takes care of the routing functions; it contains all system
configuration data and master copies of distributed files, and also
responsible for the central functions of the signalling system CCS7.
d) M – Marker?
Marker controls and supervices the GSW – group switch, hunts circuits
and is responsible for connection and releasing of all connections. M,
GSW, TG and DTMFG make up switch-over entity which is duplicated.
e) VLRU – Visitor Location Register Unit?
VLRU contains information about each subscriber which is currently being
served by the MSC.
f) IWCU – Interworking Control Unit?
IWCU controls the different modem pools and echo cancellers.
g) TG – Tone Generator?
Plug-in unit located in the Marker which produces tones given in the
different call phases.
The routing zone (RZ) is used to identify the local service centre area under which the BTS is
located. The local service centre provides, for example, local emergency services, weather and taxi
RZ =routing zone
The parameter is an integer (decimal value) which specifies to which routing zone the area
service number belongs.
The minimum value of the parameter is 0. You can check the maximum value in the dynamic
guide. The characters & and && can be used.
The parameter is obligatory.
The tariff area (TA) is used to indicate the price range of a call. The tariff area is a
BTS-specific (that is, cell-specific) parameter, and it enables the charging based on the cell where
the mobile subscriber is located.
C) ZEPO OUTPUT BTS DATA
BSC NAME: NBSC2 NUMBER: 00004
LA NAME: NOKIALAC3 LAC: 04230
BTS ADMINISTRATIVE STATE„„„„„„„„„：UNLOCKED
DOWNLINK DTX DISABLED BY MSC„„（DTX）„：ON
CELL TEST STATE„„„„„„„„„„„（TE）„：NORMAL CELL
A) 第三个计费文件压缩了没有？ No
The storing status output data also contains three flags:
B (Back up taken) There is a backup copy of the file. Since this flag is a part of an
optional feature, it is not available in all network elements.
S (Skipped) The file has been skipped. This means that the data included in the
files is not in the same order in which it was created. Skipping can be done only if
overwriting of untransferred files is prevented.
O (Overwritten) The file has been opened to be written before the previous file has
been marked to be transferred. The overwriting of untransferred files can be prevented.
C) 从哪个控制文件可以读到文件的状态？ TTSCOF D) 从哪个控制文件能读到文件的传送时间？TTTCOF
A file is identified according to its ordinal number in the VDS Device Data Storage
Control File (TTSCOF) and in the VDS Device Data File Transfer Control File (TTTCOF).
The TTSCOF includes the information of the status of the file, the time when the file
was opened for writing data, when the file became full, when file was closed (set FULL)
with the MML command IFS, or when file was closed by time supervision. The TTTCOF
includes the last time when the file was transferred to the postprocessing system (for example
the billing centre).
The data in the TTSCOF also indicates whether the attempt to update the file on both
disks, compressed and non-compressed, succeeded. In addition, the output data includes
three flags: B (Backup taken) which tells whether there is a backup copy of the file, S
(Skipped) which tells if a file has been skipped, and O (Overwritten) which tells whether the
file has been overwritten before the previous file was transferred.
NUMBER STATUS COMPRESSED FILLING TIME TRANSFER TIME
1 TRANSFERRED OK/- - - - 1996-01-18 21:36:03 1996-01-18 22:40:00
2 TRANSFERRED OK/- - - - 1996-01-18 21:36:07 1996-01-18 22:50:00
3 FULL OK/- B- - 1996-01-18 21:36:11 1996-01-17 06:47:00
4 FULL OK/- B- - 1996-01-18 21:36:14 1996-01-17 06:52:00
5 FULL OK/- BS- 1996-01-18 21:36:18 1996-01-17 07:03:00
6 FULL OK/- B- - 1996-01-18 21:36:22 1996-01-17 07:06:00
7 FULL OK/- B-O 1996-01-18 21:36:25 1996-01-17 07:09:00
22. CD ,
C． 之前WQB没有错误，发现Billing Center 没有停止对用户数据操作
24．解释Service Terminal 命令：
25．110等Emergency call 属于哪种分析：Normal preanalysis
26．DRI看到的结果，正常的control mode 是什么？如何修改？
plesiochronous operation模式 可以执行ZDRM:P;修改为
PDP TYPE ......................... IPV4的意思 type of the PDP context APN .............................. *的意思 access point name
查看QoS Profile ZMYO:TYPE=QOS
什么是BIT RATE FOR UPLINK
29．MSC-B无法paging用户，MSC-A上的clear code 是多少？还有相关的选择题