Activation/Deactivation Bit Error Rates - 3Com SuperStack II PathBuilder S330 Reference Manual

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 parameter 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 for T1 UNI ports to System.
System — Configures the T1/E1 UNI with IMA interface to use the system
clock as defined in the System Clock Configuration menu as its timing source.
For details about designating the system clock, see "Configuring the System
Clock" in Chapter 3.
Loop — Configures the T1 module to use the input port Rx clock as the timing
source; timing is received from the service "loop." This configuration is not
recommended for T1 UNI ports.
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
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: 15 to 30. 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
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 5 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.
Configuring the T1/E1 Interface
-4
-4 , 10
79
-5
, 10 ,
-5 , 10 -6 ,