PEF82912FV14XP Lantiq, PEF82912FV14XP Datasheet - Page 113

• Manufacturer Part Number: PEF82912FV14XP
• Manufacturer: Lantiq

Specifications of PEF82912FV14XP

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Supplier Unconfirmed

•
Table 28
C/I ind.
DR
DC
PU
AR
AI
2.4.11
For North American applications a maintenance controller according to ANSI T1.601
section 6.5 is implemented. The maintenance pulse stream from the U-interface Metallic
Loop Termination circuit (MLT) is fed to pin MTI, usually via an optocoupler. It is digitally
filtered for 20 ms and decoded independently on the polarity by the maintenance
controller according to
detecting the DC and AC signaling format. The Q-SMINT I automatically sets the U-
transceiver in the proper state and issues an interrupt. The state selected by the MLT is
indicated via two bits.
The Q-SMINT I reacts on a valid pulse stream independently of the current U-
transceiver state. This includes the power-down state.
Data Sheet
Meaning
LT has decided to deactivate or
activation was lost:
– after an activation or
– after an activation attempt or
– after reset
four IOM
code DC are issued before
permission to turn off the clocks
clocks are on;
U-interface is not transparent
but may be synchronous (e.g.
U-only activation)
used during activation. U-
interface is synchronous and is
waiting for an ok from the
downstream device
U-interface transparent
Metallic Loop Termination
Appearance of the State Machine to the Software
®
-2 frames with C/I
Table
29. Therefore, the maintenance controller is capable of
99
Options
DI
TIM
TIM
AR
any
other
C/I-
code
any
C/I-
code
AI
--
EI1 or
act=0
Acknowledge and give
permission to turn off
the clocks
Acknowledge, clocks
will stay active
turn on clocks
start U-activation
no action, permission to
turn off the clocks will be
given
no action, clocks will
remain on
accept that activation
can continue, layer 2 of
the downstream device
is ready. Then wait for
CI/ indication AI
no action, transmit data
report problem on
downstream device
Functional Description
PEF 82912/82913
2001-03-30
U-
transp
arent
no
no
no
no
yes