Table of Contents
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Framing—The type of frame organization configured for the T1 port interface:
D4 or ESF for DS1. Set this parameter to match the service provider or device
connection framing. For E1, Framing is a read-only parameter and is always set to
multi-frame.
CAUTION: A framing mismatch can cause LOF, OOF alarm conditions and result in
traffic loss.
Timing—The type of input clock service configured for the DS1 module. Set the
timing source to system if you are using the DS1 module to connect to the
network.
System—Configures the DS1 module to use the internal clock as the timing
source.
Loop—Configures the DS1 module to use the input port Rx clock as the timing
source; timing is received from the service "loop." Select Loop if the DS1 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 (DS1 only)—Setting for the receive signal level: 26 or 36 dB.
Inband Lpbk (DS1 only)—Inband loopback. Enables the inband loop-up or
loop-down code: loop-up (enabled) or loop-down (disabled).
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 DS1/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
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
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.
Activation/Deactivation Bit Error Rates
Table 33 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 DS1 UNI or E1 UNI with IMA Modules
137
-4
-5
-6
-7
, 10
, 10
, 10
.
-4
-5
-6
, 10
, 10
,
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