Configuring the T1/E1 Interface 91LBO (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 theCSU/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 tomulti-frame. Set this parameter to match the service provider or device connectionframing.CAUTION: A framing mismatch can cause LOF, OOF alarm conditions and result intraffic 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 timingsource.Loop—Configures the T1 module to use the input port Rx clock as the timingsource; timing is received from the service “loop.” Select Loop if the T1 UNImodule is used for the network/carrier service termination, in which case thecarrier (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. AFAmonitors the error rate detected by the CRC (cyclic redundancy check)error-checking scheme of each of the T1/E1 links (ports). It automatically disablesand re-enables a port when the error rate on that port is at a set level for a settime.Activation Rate—The CRC (cyclic redundancy check) BER (bit error rate) at whichAFA 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 BitError Rates” below. This parameter appears only when AFA is enabled.Activation Min.—The period during which AFA monitors the link condition priorto taking it out of service, in minutes: 1 to 15. This parameter appears only whenAFA is enabled.Deactivation Rate—The CRC (cyclic redundancy check) BER (bit error rate) atwhich 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/DeactivationBit Error Rates” below. This parameter appears only when AFA is enabled.Deactivation Min.—The period during which AFA monitors the link conditionprior to putting it in service, in minutes: 1 to 15. This parameter appears onlywhen 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 RatesTable 22 translates bit errors rates into the total number of errors for various timeperiods. Use this table as a reference when you are selecting activation anddeactivation bit error rates for the AFA feature.
