PEB2096 SIEMENS [Siemens Semiconductor Group], PEB2096 Datasheet - Page 43

• Manufacturer Part Number: PEB2096
• Description: Octal Transceiver for UPN Interfaces OCTAT-P
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Signals controlling and indicating the internal state of all U
are called INFOs. Four different INFOs (INFO 0, 1W, 1/2 and 3/4) can be sent over the
U
Activation, Test Mode, Deactivated, Reset,...) of the connected transceivers (e.g.
OCTAT-P and ISAC-P TE). When the line is deactivated INFO 0 is exchanged by the
U
line; in either direction.
When the line is activated INFO 3 (in upstream direction) and INFO 4 (in downstream
direction) are continually sent. Info 3 and 4 contain the transmitted data (B1, B2, D, M).
Pending Activation
This state results from a request for activation of the line, either from the terminal
(INFO 1w) or from the layer-2 device (AR, AR2 or ARL). Info 2 is then transmitted and
the OCTAT-P waits for the responding INFO 1 from the remote device.
Synchronized
Upon receipt of INFO 1 the OCTAT-P must synchronize itself to the signal. This process
takes at most 10 ms after which the OCTAT-P supplies INFO 2 to the remote terminal.
It then synchronizes to the OCTAT-P.
Activated
Info 1 has a code violation in the framing bit (F bit) whereas INFO 3 has none. Upon the
receipt of 2 frames without a code violation in the F bit, the OCTAT-P enters the activated
state and outputs INFO 4. The line is now activated; the OCTAT-P sends INFO 4 to the
remote, the remote sends INFO 3 to the OCTAT-P.
Resynchronization
If the OCTAT-P fails to recognize INFO 3, for whatever reason, it will attempt to
resynchronize. Entering this state it will output INFO 2. This is similar to the original
synchronization procedure in the pending activation state (the indication given to layer 2
is different). However as before, recognition of INFO 1 leads to the synchronized state.
OCTAT-P state diagram is shown in figure 21.
3.9.2
Semiconductor Group
PN
PN
transceivers at either end of the line. Info 0 indicates that there is no signal on the
interface depending on the actual state (Synchronized, Activated, Pending
Info Structure on the U
PN
Interface
43
PN
transceiver state machines
PEB 2096
01.96