With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
frxCdEsTx
Cisco 90i Cd Errored Seconds Tx
1.3.6.1.4.1.1570.1.6.5.1.21
Current Day Errored Seconds - Transmit direction. Transmit is data from the network towards the customer. Errored Seconds are seconds in which one or more block errors occur. These errors are measured at the physical link level (e.g. DSL CRC or BPV errors) and not at the frame relay level. This register is defined by Bellcore TR-TSY-000829. Indexed by Bank.ChannelUnit.Port.Address (note: DDS loops cannot detect transmit errors)
Back to CISCO-90-MIB MIB page.
IPHost Network monitor allows you to monitor frxCdEsTx on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.