Bit Error Rate Testing - Cisco 7304 Installation And Configuration Manual

Chapter 4 Configuring the 6E3 Line Card
Figure 4-1
LIU
LIU

Bit Error Rate Testing

The ratio of received bits on an interface that contain errors is called the bit error rate (BER). A bit error
rate test (BERT) is used to check the BER. E3 bit error rate testing is used on the Cisco 7304 router to
check communication between local and remote E3 ports. If traffic is not being transmitted or received
on an E3 port, or if the quality of the line simply needs to be tested, E3 bit error rate testing can be used
to test the port.
For information on performing bit error rate testing, refer to the Configuration Tasks section of the T3
Maintenance Data Link Messages on the Cisco 7304 Router documenat the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121limit/121ex/121ex12c/
e_t3bert.htm#1023406
OL-5061-01
E3 Loopback Paths
Tx DS3 framer
Tx/Rx
HDLC
Rx DS3 framer
QJET
No loopbacks
Tx DS3 framer
Tx/Rx
HDLC
Rx DS3 framer
QJET
Line loopback
Cisco 7304 6-Port Clear Channel E3 Line Card Installation and Configuration
Checking the Configuration
Tx DS3 framer
LIU
Rx DS3 framer
QJET
Diagnostic or local loopback
Tx DS3 framer
LIU
Rx DS3 framer
QJET
Payload loopback
Tx DS3 framer
LIU
Rx DS3 framer
QJET
DTE loopback
Tx/Rx
HDLC
Tx/Rx
HDLC
Tx/Rx
HDLC
4-17