3Com 3C63311 Reference Guide - Page 103
Activation/Deactivation Bit Error Rates, Activation Min.
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Configuring the T1/E1 Interface 91 LBO (T1 only)-Line Build Out. The setting for the transmit signal level: 0, 7.5, 15, or 22 db. The LBO compensates for the distance between the card and the CSU/repeater. It is a setting for the transmit signal level. Framing-The type of frame organization configured for the T1/E1 port interface: D4 or ESF for T1. For E1 Framing is a read-only parameters and is always set to multi-frame. Set this parameter to match the service provider or device connection framing. CAUTION: A framing mismatch can cause LOF, OOF alarm conditions and result in traffic loss. Timing (T1 only)-The type of input clock service configured for the T1 module. Set the timing source to system if you are using the T1 module as a trunk module. System-Configures the T1 module to use the internal clock as the timing source. Loop-Configures the T1 module to use the input port Rx clock as the timing source; timing is received from the service "loop." Select Loop if the T1 UNI module is used for the network/carrier service termination, in which case the carrier (the service "loop") typically provides the timing source. Gain Limit (T1 only)-The setting for the receive signal level: 26 or 36 dB. AFA-Enables (yes) or disables (no) Automatic Frequency Adjustment. AFA monitors the error rate detected by the CRC (cyclic redundancy check) error-checking scheme of each of the T1/E1 links (ports). It automatically disables and re-enables a port when the error rate on that port is at a set level for a set time. Activation Rate-The CRC (cyclic redundancy check) BER (bit error rate) at which AFA takes a link out of service based on the Activation Min.: 10-4, 10-5, 10-6, 10-7. For further details about setting this parameter, see "Activation/Deactivation Bit Error Rates" below. This parameter appears only when AFA is enabled. Activation Min.-The period during which AFA monitors the link condition prior to taking it out of service, in minutes: 1 to 15. This parameter appears only when AFA is enabled. Deactivation Rate-The CRC (cyclic redundancy check) BER (bit error rate) at which AFA puts a link in service based on the Deactivation Min.: 10-4, 10-5, 10-6, 10-7. For further details about setting this parameter, see "Activation/Deactivation Bit Error Rates" below. This parameter appears only when AFA is enabled. Deactivation Min.-The period during which AFA monitors the link condition prior to putting it in service, in minutes: 1 to 15. This parameter appears only when AFA is enabled. Admin Status-Administrative status: Out of Service or In Service. Inband Lpbk (T1 only)-Enables or disables inband loopback detection. Activation/Deactivation Bit Error Rates Table 22 translates bit errors rates into the total number of errors for various time periods. Use this table as a reference when you are selecting activation and deactivation bit error rates for the AFA feature.