PEB24901HV1.2 Lantiq, PEB24901HV1.2 Datasheet - Page 34

• Manufacturer Part Number: PEB24901HV1.2
• Manufacturer: Lantiq

Specifications of PEB24901HV1.2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

errors within 1000 s in the LT (1 frame error detected in the NT and transmitted via M
symbol).
3.4
A "Call-by-Call" activation or deactivation of the transmission link is provided for ISDN
basic access. In a deactivated state, the line and the terminal equipment (if it is not a
remote power fed device) are powered down. The entire transmission link, consisting of
one or more individual lines, has to be activated to enable the connection between
terminal equipment (TE) and exchange (LT).
The activation procedure is always initiated by one of the two end points and is handled
between them. The deactivation procedure can be initiated only by the exchange.
Seven states of activation of transmission lines can be distinguished.
1. Activation of the link is initiated by one of the two ends.
2. Transparent: In the activated state, the user data is transmitted from exchange to TE
3. Deactivation is done in two steps on each individual line separately.
The transmission link is totally deactivated thereafter.
To save time, each section of line does not have to wait for the transition of the entire line
before it is able to proceed to the next state. Therefore the individual line sections may
be at different states of activation.
To control the procedures, some control information has to be transmitted over the lines
(Uk0 interface, S-bus). Therefore, special signal elements on the Uk0 interface have
been specified. In the IOM-2 interface, the 32 kbit/s C/I-channel is provided to exchange
the necessary control information.
The IOM-2 interface and the Uk0 interfaces are defined to prohibit states which cannot
be left with normal commands and infos. Deactivation of the line leads all devices to
defined states. Nevertheless, it is recommended to implement a power-on reset at pin
RES to start in a defined manner, and to shorten the first deactivation and activation.
Semiconductor Group
– Line awake: Each individual line is being awoken, but is not yet synchronized, data
– Synchronization downstream: synchronization is always done downstream first,
– Synchronization upstream: Because the delay differs from line to line, bit
– Synchronized: All layer 1 units of the link are told by the exchange that
and vice versa.
– Deactivation request downstream
– Deactivation acknowledge upstream
transmission is not yet possible
the whole line has to synchronize on the exchange
synchronization is necessary in the LT
synchronization has been finished
Control Procedures
33
PEB 24901
02.95