STLC5411 ST Microelectronics, STLC5411 Datasheet - Page 39

• Manufacturer Part Number: STLC5411
• Description: 2B1Q U INTERFACE DEVICE
• Manufacturer: ST Microelectronics

(H1), AR instruction forces UID through the ap-
propriate sequence to activate the line by sending
TN followed by SN1. Beeing in the U-only-active
state (H8A), AR command forces the sai bit equal
1 to the line. Is intended to transfer to the network
an activation attempt at the S/T interface.
1011 (SP3): Send Single Pulse +3 and -3
SP3 test command forces UID to send +3, -3
pulses to the line, one pulse per frame.
1100 (AI): Activation Indicate
AI command forces act bit equal one in SN3 sig-
nal transmitted to the line. Is intended to reflect an
activate state at the S/T interface.
1110 (AIL): Activation Indicate Loopback
Identical to AI command. Ensure direct compati-
bility with status indications of SID-GCI.
1111 (DI): Deactivation Indicate
The DI command allows the UID to automatically
enter the power down state if the line is deacti-
vated. DI command has no effect as long as the
line is not deactivated (DI status indication re-
ported).
NT mode: Status indication
0000 (DP/LSD): Deactivation pending / Line sig-
nal detected
When in the deactivated state (H1) either pow-
ered up or down, LSD status indication is re-
ported if TN wake-up tone is detected except if
NT1 AUTO is selected; in this configuration, UID
must check uoa bit before to send (or not) LSD.
When in the superframe-synchronized states, DP
status indication reports that the dea bit has been
received equal zero from the line. UID enters in
the receive reset state. When NT1-AUTO mode is
selected, DP status indication is reported also
when a transmission error has been detected on
the loop. This is intended to ensure immediate
deactivation of the S/T interface.
0001 (EIU): Error Indication User
EIU status indication is reported in following
cases:
a. to acknowledge RES command. UID is deacti-
b. to report a Loss of signal for more then 480ms
c. to report a Loss of synchronization for more
d. to report that an expire of Timer 4 interrupt has
When NT1-AUTO is selected, EIU is replaced by
(DP) (except in case c.).
0100 (EI): Error Indication
vated, ready for a cold start.
on the line.
than 480ms on the line. In this case, when NT-
RR-AUTO is selected, EIU is replaced by
RES;
reset UID ready for a cold start.
EI status indication reports that act bit has been
detected equal zero.
0110 (UAP): U interface Activation pending
Is significant only when RR bit in CR2 has been
set equal one or if NT-RR-AUTO mode is se-
lected. UAP reports that the receiver is super-
frame synchronized with uoa bit received equal
zero.
1000 (AP): Activation Pending
AP reports that the receiver is superframe syn-
chronized with uoa bit received equal one .
1010 (ARL): Activation Request Loopback
Is significant only when NT1-AUTO or NT-RR-
AUTO mode is selected. ARL reports that an eoc
message has been received requiring to operate
a local 2B+D loopback. When connected to SID-
GCI in a NT1 or to UID in LT-RR-AUTO mode in
a regenerator, 2B+D loopback command is there-
fore automatically provided.
1100 (AI): Activation Indication
AI reports that UID is superframe synchronized
with act and uoa bits received equal one.
1111 (DI): Deactivation Indication
DI reports that UID has entered the deactivated
state (H1).
LT mode: Command
0000 (PUP/DR): Power Up / Deactivation Re-
quest When in the power down state, PUP com-
mand powers up the device ready for a cold or a
warm start. When in one of the superframe syn-
chronized states, DR command forces dea bit on
the line equal zero for four consecutive superfra-
mes before ceasing transmission.
0001 (RES): Reset
RES command resets UID ready for a cold start.
Configuration registers are not changed. RES can
be operated when the device is either powered up
or down. If RES command is applied when the
line is not fully deactivated, UID returns EIU indi-
cation and goes in J1 state (Receive Reset).
If RES command is applied when the line is not
fully deactivated, UID properly ends the activation
before to come back in J1 state; in this case EIU
indication is returned.
0010 (SP1): Send Single Pulse +1 and-1
SP1 test command forces UID to send +1, -1,
pulses to the line, one pulse per frame.
0011 (RDT): Random Data Transmitted
RDT test command forces UID to send data with
random equiprobable levels at 80 kbaud.
0100 (FA0): Force act bit to Zero
FA0 command forces the act bit to 0 in the SL3
signal transmitted to the line. Is intended to reflect
a transmission failure detected on the network
side of the loop relative to UID.
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