Synchronous Digital Hierarchy, : Link Design
Intra office < 2 Kms.
Short Haul : < 15 Kms
Long Haul : < 40 Kms. ( 1310 nm)
< 80 Kms. ( 1550 nm)
STM -1 Short Haul Long Haul
TxP = -15db TxP = -5db
RxP = -28 db RxP = -34 db
Path Penalty 1 db Path Penalty 1 db
TxP = -15db TxP = -3db
RxP = -28 db RxP = -28 db
Path Penalty 1 db Path Penalty 1 db
STM -16 Short Haul Long Haul
TxP = -5db TxP = -2db
RxP = -18 db RxP = -28 db
Path Penalty 2 db Path Penalty 2 db
* Path penalty for dispersion characteristics, jitter, or reflections, laser chirp etc.
* As per G. 652 1310 nm : .3 to .4 db / Km
1550 nm : .15 to .25 db / Km
* G. 957 Thumb rule
.8 db / km for SH
.5 db / Km for 1310 nm LH
.3 db / km for 1550 nm LH
Total Loss = Cable Loss + splicing Loss + connecterisation Loss
Margin = TxPWR - RX Pwr - Total Cable loss
Splice Loss = .05 db per splice < .03 to .06 db> , .25 db / splice
connecterisation loss = .75 db per mated connector
3 db margin for aging and repair
* 10 (p-12) BER for 10(p-10) - > 3 db improvement
