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On a single PA-E3, there are one or two serial E3 ports, each with two connectors (receive and
transmit), where you connect the Cisco 75-ohm coaxial cable. The 75-ohm coaxial cable
(Cisco part number CAB-ATM-DS3/E3) for the PA-E3 is available only from Cisco Systems; it is
not available from outside commercial cable vendors.
The Cisco E3 75-ohm coaxial cable, which comes with an attached ferrite sleeve (see Figure 1-5),
is available only in 10-foot (3.05-meter) lengths. The typical maximum distance between stations
for E3 transmissions is 1300 feet (396 meters).
Note
EMI decoupling clips on the Rcvr end of the cable (see Figure 1-5) if compliance with European
certification standards for emission control is required (EN55022/CISPR22 Class B for radiated
emission levels).
Figure 1-5
You can test the DTE-to-DCE cable connection by using the loopback dte command. See the
"Using the loopback Command to Verify the Physical Interface" section on page 8-20 for more
information.
Interoperability Guidelines for PA-E3 DSUs
The PA-E3 supports several types of integrated DSUs. Table 1-2 lists the feature compatibilities of
the PA-E3 DSUs.
Table 1-2
DSU
DL3100E
Kentrox
1
2
For E3 (75-ohm) connections, you must have ferrite beads on the 75-ohm coaxial cable and
PA-E3 Cables
EMI decoupler clip
Ferrite beads
Feature Compatibilities of PA-E3 DSUs
Full Rate
Support
Yes
Yes
DL3100E does not support scrambling. However, the PA-E3 can turn on scrambling
in DSU mode 0 for connecting to another PA-E3. The PA-E3 supports either
scrambling (in mode 0) or DL3100E subrate, not both at the same time.
The PA-E3 supports either scrambling or Kentrox subrate, not both at the same time.
Scrambling
Subrate
Support
Support
1
1
No
Yes
2
2
Yes
Yes
Interoperability Guidelines for PA-E3 DSUs
Overview 1-5
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