10
The longer monitor channel has three low-loss MPO connections, one low-loss LC connection,
and the length is 110m. The shorter monitor channel has one low-loss MPO connection,
one low-loss LC connection, and the length is 20m. Follow the procedure of Section 5 to
provide the monitor company the information they need to evaluate your channel design for
compatibility with their equipment.
LazrSPEED 550, 70/30 split ratio, MAIN (70%) output
# LC
Connections* with:
1 MPO
2 MPOs
3 MPOs
4 MPOs
5 MPOs
6 MPOs
1
480 (145)
430 (130)
360 (110)
280 (85)
200 (60)
100 (30)
2
440 (135)
380 (115)
310 (95)
230 (70)
130 (40)
0 (0)
3
390 (120)
330 (100)
250 (75)
150 (45)
30 (10)
0 (0)
4
340 (105)
280 (85)
180 (55)
70 (20)
0 (0)
0 (0)
5
300 (90)
210 (65)
100 (30)
0 (0)
0 (0)
0 (0)
6
250 (75)
130 (40)
0 (0)
0 (0)
0 (0)
0 (0)
Table 3. Channel topology limits for 8GFC on LazrSPEED 550 for 70% TAP channel
Optical Channel Loss Evaluation with TAPs
The following subsections are presented in three parts, each of which examines one of the
three different channels topologies created when deploying TAPs—one main channel topology
and two monitor channel topologies. Channel loss evaluation of the two monitor channels
is necessary when designing channels with 70/30 TAP modules. Channel loss evaluation
provides the monitor equipment company information to evaluate the proposed channel for
interoperability with their equipment. This is because the high loss of a 30% split requires better
than minimally complaint receivers which are proprietary to the monitor company.
While the main channel loss is independent of the placement of the TAP module within the
channel, the monitor channel loss depends on the placement of the TAP module. This is
because there are two different channel topologies from monitor to each end of the channel.
These two monitor channel topologies are usually of different lengths. Consequently in the
following evaluation we refer to these two channel topologies as “shorter monitor channels”
and “longer monitor channels”.
Loss Evaluation of Main Traffic Channels
Figure 6
shows the main traffic channels of an optical link with a 70/30 TAP inserted. The
pink arrow shows one direction signal flow, but traffic in the other direction sees the same loss.
All cabling is LazrSPEED 550 (OM4). The trunk cable is 80m long, the LC/LC equipment
cords are 10m each. Using
SYSTIMAX Solutions Link Loss Calculator Version 7.1
plug in the
following factors: a 70 percent TAP with two low-loss MPO connections, two low-loss LC
connections, and 100m of “LazrSPEED
®
with InstaPATCH @ 850nm” fiber cable. Using those
inputs, the maximum loss of the main channels is calculated as 2.88dB.
