Cisco Systems PA-2E3 manual Interoperability Guidelines for PA-E3 DSUs

Interoperability Guidelines for PA-E3 DSUs

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 For E3 (75-ohm) connections, you must have ferrite beads on the 75-ohm coaxial cable and 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 PA-E3 Cables

EMI decoupler clip

RCVR	XMTR	RCLK	FERF
			T3

AIS OOF

H10314

Ferrite beads

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	Feature Compatibilities of PA-E3 DSUs
	Full Rate	Scrambling	Subrate
DSU	Support	Support	Support
DL3100E	Yes	No1	Yes1
Kentrox	Yes	Yes2	Yes2

1DL3100E 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.

2The PA-E3 supports either scrambling or Kentrox subrate, not both at the same time.

Overview 1-5