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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.
INSTALLATION AND USER MANUAL
Chapter 1.
Introduction
5
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