C-DOT DSS MAX User manual

C-DOT NSE
INSTALLATION
AND
USER MANUAL

System
Practices
Section No. 403-305-0717
Draft 03, August 2000
C-DOT DSS MAX
INSTALLATION
AND
USER MANUAL
© 2000, C-DOT
Printed in India

C-DOT DSS MAX
MAINTENANCE ALARMS AND REPORTS
DRAFT 03
AUGUST 2000
BHADRA 2057
SERIES 300 : INSTALLATION
CSP SECTIONNO.403-305-0717
THIS C–DOT SYSTEM PRACTICE REFERS TO THE C–DOT NETWORK SYNCHRONISATION
EQUIPMENT (ABBREVIATED AS C–DOT NSE IN THE REST OF THIS PUBLICATION).
THE INFORMATION IN THIS SYSTEM PRACTICE IS FOR INFORMATION PURPOSES AND IS
SUBJECT TO CHANGE WITHOUT NOTICE.
A COMMENT FORM HAS BEEN INCLUDED AT THE END OF THIS PUBLICATION FOR
READER'S COMMENTS. IF THE FORM HAS BEEN USED, COMMENTS MAY BE ADDRESSED
TO THE DIRECTOR (SYSTEMS ), CENTRE FOR DEVELOPMENT OF TELEMATICS, 39, MAIN
PUSA ROAD, NEW DELHI - 110 005
©2000 BY C–DOT, NEW DELHI.

Table of Contents
Chapter 1. Introduction.....................................................................................................................................5
Chapter 2. Product Description........................................................................................................................6
2.1. System Architecture................................................................................................................6
2.2. Input Clock Selection...............................................................................................................6
2.3. Synchronised Clock Outputs.................................................................................................11
2.4. Check Inputs.........................................................................................................................11
2.5. User Interface Panel..............................................................................................................11
2.6. NSE Terminal Interface........................................................................................................11
Chapter 3. NSE Packaging Details ................................................................................................................12
3.1. General...................................................................................................................................12
3.2. Firmware Details...................................................................................................................12
3.3. Jumper Details for NCP Card...............................................................................................13
3.4. Jumper Details for NIO Card ...............................................................................................14
Chapter 4. NSE Integration with Exchange..................................................................................................15
4.1. Introduction............................................................................................................................15
4.2. NSE Integration with E-10B Exchanges .............................................................................15
4.3. NSE Integration with C-DOT SBMs....................................................................................18
Chapter 5. Slip Monitoring .............................................................................................................................29
5.1. Slip Monitoring in C-DOT DSS.............................................................................................29
Chapter 6. Debugging Aids for NSE ..............................................................................................................34
\\LOTUS\HOME\NSE\WORD\NSEINUSR.DOC July 28, 2000

INSTALLATION AND USER MANUAL 5
Chapter 1.
Introduction
Network Synchronisation Equipment (NSE) has been developed by C-DOT to fulfill
the requirements of synchronising all the level 2 exchanges in the Indian network.
This equipment can be interfaced with E-10B, C-DOT SBM and C-DOT MAX-L
exchanges. The input and output interface of NSE are developed as specified by
ITU-T Rec G.703. Both E-10B and C-DOT MAX-L exchanges accept 2.048 MHz
clocks as specified by G.703/6 Rec. However C-DOT SBMs accept 8.192 MHz clock
which is also supplied by NSE.
This equipment has two modes of operation. Selection of a particular mode of
operation of NSE is jumper selectable and is explained in Chapter 3 of this
document.
a) Level 2 Mode : This mode of NSE is suggested for supplying synchronised
output clock of stability 1E-10/day to exchanges (E-10B and C-DOT MAX-L).
The equipment is named NSE2 in this mode of operation.
b) Level 4 Mode : This mode of NSE is suggested for supplying synchronised
output clock of stability 1E-8/day to exchanges (C-DOT SBMs). The
equipment is named NSE4 in this mode of operation).
It may be noted that the NSE2 and NSE4 are the same equipment except that
NSE2 has two additional level 2 crystal oscillators mounted for level 2 operation.

6 C-DOT NSE
Chapter 2.
Product Description
2.1. SYSTEM ARCHITECTURE
The C-DOT Network Synchronization Equipment (NSE) consists of a PC type
cabinet which houses duplicated controller and PLL (NCP) cards, duplicated
input/output interface (NIO) cards, and one display card, keyboard card and mother
board. It has the provision to mount two oven-controlled crystal oscillator 8 (OCXO)
required for level 2 operation. The controller card has a software controlled digital
Phase Locked Loop (PLL), microprocessor and related memory, output clock
interface and the display and keyboard interface. The NSE input/output card has
the various types of input interfaces to take in the network clock. It extracts clock
from the input digital trunks and provides standard G.703/10 interfaces for the
output clocks.
One NCP card and one NIO card form a self-contained security block. It can work
with the other copy of these two cards in active/standby mode. Output to/from these
cards are connectorised on the motherboard. The user interface panel indicates the
presence and absence of input clocks/trunks and the status of the PLL in the cards
and the general card status. Each controller card provides two ACIA links, one of
which is used for communication with the mate while the other is used to connect a
VT-220 terminal for remote operations.
Fig. 2.1 and Fig. 2.2 show the equipment front panel and back panel details.
2.2. INPUT CLOCK SELECTION
The input reference clock selection can be automatic or manual. On power on or
reset, the NSE comes up in the automatic mode, wherein it selects one of the input
clocks according to a fixed hardwired priority. The order of priority is CLK0, CLK1,
CLK2. If none of clocks are present or available for selection, then the NSE goes
into the free run mode. The operator can override this selection by going to manual
mode and selecting a clock using the keyboard. If the input clock is present, the
LED corresponding to it will glow green. The LED corresponding to the selected
reference blinks once in 2 seconds (1Hz Freq.).
It may be noted that a clock used as Reference to NSE shall always be taken from a
higher level exchange.

PRODUCT DESCRIPTION
INSTALLATION AND USER MANUAL 7
FRONT VIEW OF NSE
FIG. 2.1
LED PANEL
TEST KEYS FUNCTION KEYS
COPY Ø
TEST
5
Frc Card
Frc Clk
Mode
ACK
6
Select
2
1
Copy 1
Copy 0
Copy 0 Pwr
4
3
Copy 1
Copy 0
MONITORING LED's
FUNCTION KEYS
COPY 1
Target Sys Sts
COPY 0
Sys 1
Sys 0
Sys 2
COPY 1
Sys 0
Sys 1
Sys 2
Frc Card
Frc Clk
Select
Mode
12
3
Copy 1 Pwr
4
BEEPER LOCK & KEY
\DESIGN\NSE-IUM\NSEUMFV

Chapter 2
8 C-DOT NSE
J3 J4 J5 J6 J13
J12
J11
J10
NIO C0
NSE C1
c
b
a
a
b
c
a
c
b
c
a
b
COPY 0 COPY 1
ON ON
FUSE 2A FUSE 2A
REAR VIEW OF NSE
FIG. 2.2
a
cbca
bca
bca
b
J14
J7 J9
J8 J15 J16
NSE C0
NIO C1
a
c
b
c
b
a
b
c
a
c
b
a
W3W4W5
W1 W2
123
SYNC
G.703/10 CLOCK OUTPUTS (FOR E-10B AND MAX-L)
REF_TRK
J20 J19 J18 J17
REF_CLK2 REF_CLK0 8M_2_C0 2M 8M_1_C0 8M_0_C0
TEST_CLK 8M_2_C1 8M_1_C1 8M_0_C1
-48V INPUT RS232 INTERFACE J3, J4, J10 = G.703/10, 2.048 MHz 75 INPUTS
J6 = 2.048 MHz TTL CLOCK OUTPUT
J5, J7, J9, J12, J14, J16 = CLOCK OUTPUTS FOR C-DOT SBM EXCHAMGES
REF_CLK1
FOR DEBUGGING ONLY
SYNC OUTPUT FOR C-DOT SBMs
CHECK INPUTS
J17: PIN No. 2 OF BOTTOM MOST
CONNECTOR BLOCK (ONE INPUT)
J18: PIN No. 2 & 6 OF BOTTOM MOST
CONNECTOR BLOCK (TWO INPUTS)
G.703
J18: CHECK (MONITORING) TRUNKS
J17: POSITION 1,2,3 = REFERENCE TRUNKS
\DESIGN\NSE-IUM\NSEUMRV

PRODUCT DESCRIPTION
INSTALLATION AND USER MANUAL 9
L
FIG. 2.3
NSE POWER CABLE CONNECTIONS
\DESIGN\NSE-IUM\NSEUMPWR

Chapter 2
10 C-DOT NSE
59
6
1114
13 25
9P DTYPE CONN. FEM. 25P DTYPE CONN. FEM.
CONNECTOR AT NSE END
(RS232 INTERFACE)
CONNECTOR AT TERMINAL END
FIG. 2.4
NSE TERMINAL (RS232) CONNECTOR DETAIL
\DESIGN\NSE-IUM\NSEUMRS2

PRODUCT DESCRIPTION
INSTALLATION AND USER MANUAL 11
2.3. SYNCHRONISED CLOCK OUTPUTS
The NSE supplies six (6) ITU TG.703/10 (120Ω) output clocks. These can be used for
E-10B exchanges and C-DOT MAX-L exchange. In addition to these, it also gives
six (6) 8MHz (single ended TTL, 75 ohms) clock output along with accompanying
8KHz sync signals (differential TTL) to be used with C-DOT SBM exchanges.
A unique feature of NSE is that in duplex mode of operation, each copy of NSE
supplies half the numbers of output clocks described above and in simplex
operation, the only copy supplies all the output clocks required. This is achieved by
shorting individual card outputs on the motherboard and selecting outputs via
relays. This feature also enables synchronization of exchanges that require
duplicated input clocks as reference clocks.
2.4. CHECK INPUTS
The NSE can monitor or check clock outputs of the synchronized (target) exchanges
to verify whether they are in synchronisation with the network clock. It can take in
three (3) digital trunks (G.703/6) 120Ωand 3 G703/10, 120Ωclocks supplied from
the target exchanges for monitoring. The digital trunks are connected to the NSE in
non-regenerative mode, i.e., the clock and data information is tapped from the
trunks using high impedance terminations. This results in no disturbance in the
trunks at the destination exchanges where the trunks are terminated with their
characteristic impedance.
2.5. USER INTERFACE PANEL
NSE has a user-friendly display panel and keyboard arrangement. The display
panel shows the status of various functional blocks of NSE via a set of different
colored LEDs, Alarms are audio-visually indicated, i.e., a beeper accompanies the
LED indications. The keyboard is used for manual operations. Remoting of NSE
alarms is also possible through an opto-coupled interface. A VT-220 emulation is
supported for this purpose. Please refer to Chapter 4 of "C-DOT NSE General
Description" document for more details on the NSE user interface.
2.6. NSE TERMINAL INTERFACE
Two RS232 Interface are available for each NSE copy as shown in Fig. 2.2. For
debugging purpose a terminal may be connected to NSE as shown in Fig 2.4.

12 C-DOT NSE
Chapter 3.
NSE Packaging Details
3.1. GENERAL
The NSE card cage houses the following four types of cards
a) NSE Controller and PLL Card (NCP212/H-S01)
b) NSE Input/Output Card (NIO 499/H-S00)
c) NSE Display and Keyboard Card (NSD 463/F-O02)
d) NSE Motherboard Card (NSM 462/F-M02)
NCP and NIO form a single block and can be duplicated to operate NSE in duplex
mode of operation. The NCP and NIO cards sit on the NSM in a card cage with the
following order.
NCP copy 0 ------------ slot 1 (top)
NIO copy 0 ------------> slot 2
NIO copy 1 ------------> slot 3
NCP copy 1 ------------> slot 4 (bottom)
The NSD card is mounted on the front panel of the NSE and is connected to
both copies of NCP through 40 pin FRC connector cables.
3.2. FIRMWARE DETAILS
S.No. Device Card Position Checksum
1. EPROM 27C010 NCP U17 AB23
2. EPROM 27C010 NCP U19 2B52
3. EPLD 7128E NCP U56 1B7916
4. EPLD 7128E NIO U22 1A6DC5
5. EPLD 7128E NIO U12 1660D9
6. EPLD 7128E NIO U13 1660D9

NSE PACKAGING DETAILS
INSTALLATION AND USER MANUAL 13
S.No. Device Card Position Checksum
7. PAL 22VI0 NIO U19 3F84
8. PAL 22VIO NIO U21 53AA
9. Serial PROM NIO U24 F6116
3.3. JUMPER DETAILS FOR NCP CARD
Jumper Status Function
W1 Short Usage of write operation to FLASH PROM possible
(U17)
W2 Short Usage of write operation to FLASH PROM possible
(U19)
W3 Short Connects AGND to Gnd
W4 (1-2) Short Connects CLK~as strobe to DS1232 (to be done when
emulator is used instead of IMP)
W4 (2-3) Short Connect AS~ as strobe to DS1232
W5 (1-2) Short For Level 2 operation*
W5 (2-3) Short For Level 4 operation*
W6 Open To use direct clock as Reference 0 to PLL
W6 Short To use digital trunk as Reference 0 to PLL
W7 Open To use direct clock as Reference 1 to PLL
W7 Short To use digital clock as Reference 1 to PLL
W8 Open To use direct clock as Reference 2 to PLL
W8 Short To use digital trunk as Reference 2 to PLL
W9 (1-2) Short Connect Ext Osc Clock (8600) to PLL
W10 Short For Level 2 operation*
W10 Open For Level 4 operation*
W11 Open For Level 2 operation*
W11 Short For Level 4 operation*
W12 (1-2) Short To disable spare 2 MHz TTL O/P at connector
W12 (2-3) Short To enable spare 2 MHz TTL O/P at connector

Chapter 3.
14 C-DOT NSE
Jumper Status Function
W13 (1-2) Short To get 2 MHz Clock O/P at connector J6
W13 (2-3) Short To get 16 MHz Clock O/P at connector J6
W14 Short If PSI is mounted
W14 Open If PS2 is mounted
W15 Short If PS2 is mounted
W15 Open If PS1 is mounted
Note: Position of jumper W5, W10 and W11 decide the level 2 or level 4 operation of NSE.
* Other jumper settings may be left as per factory default settings as shown.
3.4. JUMPER DETAILS FOR NIO CARD
Jumper Status Function
Short To connect Ref-Trk1 (G.703/6) to phase
detector
W1 Open To connect reference clk 1 to phase detector
Short To connect Ref-Trk0 (G.703/6) to phase
detector
W2 Open To connect reference clk 0 to phase detector
Short To connect Ref-Trk2 (G.703/6) to Phase
Detector
W3 Open To connect reference clk 2 to phase detector
Note : Position of jumpers W6, W7, W8 on NCP card and W2, W1 and W3 on NIO
card decide whether a reference trunk is selected or reference clock is selected by
NSE.

INSTALLATION AND USER MANUAL 15
Chapter 4.
NSE Integration with Exchange
4.1. INTRODUCTION
NSE can be integrated with E-10B exchanges, C-DOT SBMs and MAX-L exchanges.
The connectivity details and procedure of integration is described for each exchange
separately in the following sections.
4.2. NSE INTEGRATION WITH E-10B EXCHANGES
4.2.1. General
NSE can supply clock to three E-10B exchange simultaneously at the same
location. The connectivity detail is shown in Fig. 4.1.
All E-10B exchanges accept clock input as specified by G.703
recommendation.
4.2.2. Procedure to Integrate NSE with E-10B
a) Make connections as shown in Fig. 4.1(a), 4.1(b), 4.2(d), 4.2(e), 4.2(f)
and Fig. 2.3.
b) Power on NSE in level 2 mode and wait for 2 hrs. ‘O/P’ LED, ‘AUTO’
LED and ‘FREE RUN’ LED on NSE display panel shall glow green.
This indicates that NSE is ready for use.
c) Connect PCMs (Maximum 3) coming from a TAX at higher level to
NSE at Ref-Trk connector [J17]. Let NSE select a PCM as reference
and synchronise to it. The maximum synchronisation time can be
around 10-12 hrs. NSE in ‘SYNCH’ mode shall be indicated by the
‘LOCK’ LED glowing on the display board.
d) Physically connect NSE 2.048 MHz, G.703 output from connector J19
to the top runway tag block at the back of the BT bay of E-10B
exchange.
e) Jack in the CIT1 card in the E10B exchange.

Chapter 4.
16 C-DOT NSE
FIG. 4.1a
NSE CONNECTIVITY WITH E-10B EXCHANGE
SLIP COUNTER
U R M
ISYM CARD
BT BAY
J18
BR
J19
INPUT TIMING IN BT
CHECK INPUT
TO NSE
FEEDBACK
TIMING
TO NSE
INPUT PCMs
FROM HIGHER LEVEL1 TAX
J17
REF_TRK CONNECTOR
G.703 OUTPUT CLK
CONNECTOR
CHECK INPUT
CONNECTOR
E-10B
EXCHANGE
C-DOT
NSE
1
2
3
RB
+- -+
L2 L1
(RUNWAY TAG BLOCK)
\DESIGN\NSE-IUM\NSEUMCE
Rx
Rx
Rx
Rx
Rx
Rx
1
3
2TO URM

NSE INTEGRATION WITH EXCHANGE
INSTALLATION AND USER MANUAL 17
\DESIGN\NSE-IUM\NSEUMCDE
NSE J18
TAB 1/2/3
TAB 1/2/3
NSE J19
7
2
1
-
+
L1
L2
+
-
120
Ω
TWISTED PAIR CABLE
120
Ω
TWISTED PAIR CABLE
ACB-NSEX-2MCX-000
ACB-NSEXMNCX-00
5
4
2
3
1
6
8
7
9
EXISTING CABLE BETWEEN
CIT1 CONNECTOR &
BT BAY TOP TAG BLOCK
TAG BLOCK ON
TOP OF BT BAY
CIT1 CARD
IN BT BAY
FIG. 4.1b
CONNECTION DETAILS FOR E10B EXCHANGE INTERFACE
120
Ω
TWISTED FOUR PAIR SHIELDED CABLE LENGTH IS TO BE KEPT TO THE MINIMUM POSSIBLE LENGTH (10-15) AS PER
SITE REQUIREMENT (ALSO TO THE BT RACK)
NOTE :-
3
4
5
6
a
c
6
ca
1
2
4
3
5
7
SLOT 49
(REF.-TRK CONNECTOR)
(MONITORING CLOCK CONNECTOR)

Chapter 4.
18 C-DOT NSE
f) Change the switch on BT bay from INDEPENDENT mode to SYNC
mode. Also reset the button on BT. All the existing non-urgent alarms
should disappear on the HASU card of E-10B exchange.
g) To verify that NSE output is supplying clock to the E-10B, connect the
Monitoring input (check input) of NSE on connector J18 to the point
shown on the BT bay as shown in the Figure 4.1a. The SYS0 LED on
NSE display panel shall light up.
h) Slip at E-10B can be monitored by connecting the slip counter at BT
bay at the point shown in the figure.
i) The slip values on counter shall be noted on daily basis at a particular
time one day before and after synchronisation.
Note :
a) If 'MSEXT' alarm on BT (CIT-1) is red then give a reset to 'HASU' card
and press 'RZLP' switch on 'HASU'.
The 'MSEXT' alarm shall be off to show proper operation.
b) The NSE 2MHz G.703 output cable length shall be not more than
15 meters.
c) No oscillator drift messages should apear
4.2.3. Preventive Maintenance at E-10B
E-10B’s local clock (given by HOSA cards) may drift with passage of time
(oscillator stability 10-6). Therefore, before synchronisation, the HOSA card
voltages should be checked on Vas points of all three HOSA cards. The
voltage indicated shall be in between 1.45V to 1.55 V D.C.
If voltages are found to be out of the above mentioned range, these should be
adjusted with the help of a potentiometer mounted on the cards.
Note: Tolerance values may vary from card to card. So if FNU alarm on
HASU is present after connecting to NSE (ie after switch over from
independent to synchronize mode, HASU card can be tuned to match and
RZLP pressed to remove the alarm. Tuning to be done to the effect that no
alarm is present both in independent & synchronize mode.
4.3. NSE INTEGRATION WITH C-DOT SBMs
4.3.1. General
C-DOT SBM accept a timing input of 8,192 MHz. NSE4 supplies three
duplicated 8.192 MHz TTL clock output along with 8 KHz SYNC signal.

NSE INTEGRATION WITH EXCHANGE
INSTALLATION AND USER MANUAL 19
Thus a single NSE can synchronise three co-located C-DOT SBMs
simultaneously.
4.3.2. Procedure to Integrate C-DOT SBMs with NSE
a) Set NSE as given in section 3.2, 3.3 & 3.4 in level 4 mode.
b) Power on NSE. NSE shall be ready when AUTO, OUTPUT and FREE
RUN LED on NSE display panel get switched on.
c) Make connections as shown in Fig. 4.2(a), 4.2(b), 4.2(c), 4.2(d), 4.2(e),
4.2(f), and 2.3.
d) At CRP terminal of exchange, give command MOD-CLKSRC-EQPAG
to equip NSE in the system. Response on the terminal shall indicate
equipage of NSE. Also an URGENT alarm shall be raised on OOD
terminal and on ADP.
e) Give SEL-CLK-SRC command to select NSE-0 (NSE clock available to
TSC-0 of SBM) or NSE-1 (NSE clock available to TSC-1 of SBM).
Response shall indicate the selection of NSE-0 or NSE-1 clock. Also the
‘URGENT’alarm shall change to ‘NORMAL’on OOD and ADP.
f) Give DISPL-CRNT-CLK-SRC command to ensure that NSE-0/NSE-1 is
the selected clock in the system.
g) Repeat (f) of 4.3.3.
Note :
Care must be taken that if NSE is to supply output to SBM local exchange, it
shall be set in level 4 mode before power on and if NSE is to supply output to a
SBM TAX then it shall be set in level 2 mode before power on. The Mode
settings are explained in section 3.3.
4.3.3. Procedure for Integration of NSE with C-DOT Exchanges (MAX-L)
a) Make connections as shown in Fig. 4.3(a), 4.3(b), 4.2(d), 4.2(e), 4.2(f),
and Fig. 2.3 for MAX-L exchange.
b) At NSE check up the jumper settings at both NIO and NCP cards as
described in Chapter 3. Also set NSE in level 2 mode.
c) Power on NSE and wait for 2 hours for warm-up. After 2 hours AUTO,
ACTIVE and FREERUN LED shall light up. Connect three reference
trunks to NSE at J17 Tab 1/2/3,as shown in Fig. 4.2 (d).
CLK0 and LOCK LED starts blinking indicating that NSE has started
locking to CLK0. After 10-12 hours LOCK LED shall become steady

Chapter 4.
20 C-DOT NSE
and indicates that NSE is completely locked to the input reference i.e.
CLK0.
d) At MAX-L exchange end, the clock cards i.e. SCK-02 cards in both
copies need to be replaced with SCK-04 cards for NSE integration.
Hence force out standby SCK-02 card and replace it with SCK-04 card.
Force in this SCK copy. Now force out the other SCK-02 card and
replace it with SCK-04 card. Force in service this SCK copy also.
e) At CRP terminal give the following commands:
1. MOD-CLKSRC-EQPAG to equip NSE clock. The response on
CRP terminal shall indicate equipage of NSE clock. Also an
urgent alarm on OOD and ADP shall be raised indicating the
equipage of NSE clock.
2. SEL-CLK-SRC to select NSE-0 (NSE clock connected to SCK-0
copy) or NSE-1 (NSE clock connected to SCK-1 copy). Urgent
alarm from OOD & ADP shall be removed.
3. DISPL-CRNT-CLK-SRC command to display which clock is
selected by the exchange i.e. NSE-0, NSE-1, CLK-0 (SCK-0) or
CLK-1 (SCK-1).
f) Connect a cable at DTS monitor port (corresponding to the selected
reference at NSE) and the IOP to get slip dumps using PORTMON and
SLIP utility as explained in Chapter 7.
Note :
a) Care must be taken that NSE 2 MHz output cable length shall
not be more than 10-15 meters.
b) SCK-04 card shall be used only when NSE output is connected to
it.