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.
