tfra08c13 ETC-unknow, tfra08c13 Datasheet - Page 76

• Manufacturer Part Number: tfra08c13
• Description: Tfra08c13 Octal T1/e1 Framer
• Manufacturer: ETC-unknow

TFRA08C13 OCTAL T1/E1 Framer
Alarms and Performance Monitoring
Secondary Loopback Modes
There are two secondary loopback modes supported:
The loopbacks are described in detail below:
Table 33 defines the deactivation of the two secondary loopback modes as a function of the activation of the pri-
mary loopback and test transmission modes.
Table 33. Summary of the Deactivation of SSTSSLB and SSTSLLB Modes as a Function of Activating the
76
Primary Loopback Mode
Secondary-single time-slot system loopback (S-STSSLB).
Secondary-single time-slot line loopback (S-STSLLB).
The secondary-STSSLB mode loops one and only one received system time slot back to the transmit system
interface. The selected time-slot data looped back is not processed by either the transmit framer or the receive
framer. The selected time slot does not pass through the receive elastic store buffer and therefore will not be
affected by system-AIS, RLFA conditions, or controlled slips events. Whenever the secondary loopback register
is programmed to the same time slot as the primary register, the primary loopback mode will control that time
slot. Once selected, the desired time-slot position has the programmable line idle code in register FRM_PR22
transmitted to the line interface one frame before implementing the loopback and for the duration of the loopback.
The secondary-STSLLB mode loops one and only one line time slot back to the line. The selected time slot data
is looped to the line after being processed by the receive framer and it passes through the receive elastic store.
The selected time slot has the programmable idle code in register FRM_PR22 transmitted to the system inter-
face one frame before implementing the loopback and for the duration of the loopback. In CEPT, selecting time
slot 0 has the effect of deactivating the current loopback mode while no other action will be taken (time slot 0 will
not be looped back to the line and should not be chosen in this mode).
Primary Loopback Modes
STSSLB
STSLLB
CNUBT
NUCLB
PLLB
BLB
LLB
If primary time slot = secondary
If primary time slot = secondary
Always
If the secondary time slot is TS0 or if the
primary time slot = secondary
Always
If the secondary time slot is TS0 or if the
primary time slot = secondary
Always
Deactivation of S-STSSLB
(continued)
If primary time slot = secondary
If primary time slot = secondary
Always
If primary time slot = secondary
Always
If primary time slot = secondary
Always
Deactivation of S-STSLLB
Preliminary Data Sheet
Lucent Technologies Inc.
Lucent Technologies Inc.
October 2000