Fluke OptiView T1/E1 Getting Started Manual page 25

If your CSU/DSU is external to the router, you can access the link from
the T1/E1 side (similar to Figure 5) or you can use a Y-Cable (see
"Optional Accessories") to tap into the serial cable between the
CSU/DSU and the router, as shown in Figure 6.
1
Item
Number
A
Existing serial cable from router to CSU/DSU
B
Router with external CSU/DSU
C
Serial Y-Cable
D
CSU/DSU
E
Serial Extension Cable
F
Serial interface
Figure 6. T1/E1 Tap with Serial Y-Cable Access
OptiView T1/E1 and DS3/E3 WAN Analyzers
4
3
OptiView WAN T1/E1
6
Description
Setting Up the Analyzer
2
5
awu12f.eps
21