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 SECTION NO. 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 INFORMAT ION IN THI S SYSTEM PRA CTICE IS FOR INFOR MATION PURP OSES AN D IS
SUBJECT TO CHANGE WITHOUT NO TICE.
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 DEVEL OPMENT OF TELE MATICS, 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
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.70 3/6 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.
INSTALLATION AND USER MANUAL 5
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, a nd one di splay ca rd, keyboa rd card and mothe r
board. It has the provision to mount two oven-controlled crystal oscillator 8 (OCXO)
required for level 2 operation. The control ler 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.
Chapter 2.
One NCP card and on e NIO card form a self-contained secu rity 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 motherboa rd. The user interface panel i ndicates 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 fi xed hardwired prior ity. The order of prior ity 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.
6 C-DOT NSE
PRODUCT DESCRIPTION
COPY 1
COPY Ø
COPY 0
Sys 0
Target Sys Sts
Select
MONITORING LED's
FUNCTION KEYS
LED PANEL
Mode
COPY 1
Sys 2
Sys 0
Sys 1
Sys 2
Sys 1
4
2
Frc Card
1
3
Copy 1 Pwr
Frc Clk
\DESIGN\NSE-IUM\NSEUMFV
FIG. 2.1
LOCK & KEY
Copy 0
Copy 0
Copy 1
Copy 1
FRONT VIEW OF NSE
FUNCTION KEYS
TEST KEYS
INSTALLATION AND USER MANUAL 7
2
Select
Mode
ACK
TEST
4
Frc Card
1
3
Copy 0 Pwr
Frc Clk
6
BEEPER
5
Chapter 2
b
a
b
c
NSE C0
FOR DEBUGGING ONLY
a
b
c
W2
123
W1
a
G.703/10 CLOCK OUTPUTS (FOR E-10B AND MAX-L)
SYNC OUTPUT FOR C-DOT SBMs
b
c
REF_TRK
a
b
c
a
b
c
G.703
a
b
c
SYNC
c
NIO C0
c
c
b
a
a
NIO C1
b
b
c
a
a
a
b
c
J16
NSE C1
8M_0_C0
8M_1_C0
a
b
c
2M
8M_2_C0
REF_CLK0
REF_CLK2
J17
J18
J19
J20
8M_0_C1
J9
J15
J8
J14
8M_1_C1
J7
J13
J6
J12
8M_2_C1
J5
J11
TEST_CLK
J4
J10
REF_CLK1
J3
W5
W4
W3
J6 = 2.048 MHz TTL CLOCK OUTPUT
J3, J4, J10 = G.703/10, 2.048 MHz 75 INPUTS
J5, J7, J9, J1 2, J14, J16 = CLOCK OU TPUTS FOR C-DOT S B M E X CHAMGES
FIG. 2.2
CONNECTOR BLOCK (ONE INPUT)
CONNECTOR BLOCK (TWO INPUTS)
J17: PIN No. 2 OF BOTTOM MOST
CHECK INPUTS
J17: POSITION 1,2,3 = REFERENCE TRUNKS
J18: PIN No. 2 & 6 OF BOTTOM MOST
J18: CHE CK (MONIT ORING) T RUNKS
\DESIGN\NSE-IUM\NSEUMRV
REAR VIEW OF NSE
COPY 1
COPY 0
8 C-DOT NSE
ON
ON
RS232 INTERFACE
FUSE 2A
FUSE 2A
-48V INPUT
PRODUCT DESCRIPTION
\DESIGN\NSE-IUM\NSEUMPWR
L
FIG. 2.3
NSE POWER CABLE CONNECTIONS
INSTALLATION AND USER MANUAL 9
Chapter 2
14
1
25P DTYPE CONN. FEM.
25
13
CONNECTOR AT TERMINAL END
\DESIGN\NSE-IUM\NSEUMRS2
FIG. 2.4
6
1
9P DTYPE CONN. FEM.
10 C-DOT NSE
9
5
CONNECTOR AT NSE END
(RS232 INTERFAC E)
NSE TERMINAL (RS232) CONNE CTOR DETAIL
PRODUCT DESCRIPTION
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 synch ronized (target) exchanges
to verify whether they are in synchronisation with the network clock. It can take in
three (3) digital trunks (G.703/6) 120Ω and 3 G703/10, 120Ω clocks 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 N S E 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.
INSTALLATION AND USER MANUAL 11
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