PEB2096HV31XT Lantiq, PEB2096HV31XT Datasheet - Page 34

• Manufacturer Part Number: PEB2096HV31XT
• Manufacturer: Lantiq

Specifications of PEB2096HV31XT

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Supplier Unconfirmed

PEB 2096
Operational Description
The control channel is unidirectional and forwards the status information of the
corresponding D-channel (blocked or available) towards the subscriber terminal.
Different existing channel structures are used to implement the control channel between
the HDLC-controllers on the line card and in the subscriber terminal.
Control Channel Implementation on the U
-Interface
PN
On U
-line card, the control channel is integrated in the C/I-channel.
PN
The OCTAT-P uses the T-channel to transmit the control channel information to the
terminal. The T-channel is a subchannel of the U
-interface with a bandwidth of 2 kbit/s.
PN
In the subscriber terminal the control channel is included again in the IOM-2 interface.
Depending on the terminal configuration two alternatives can be selected in the terminal
transceiver device.
The blocked/available information is translated directly into the S/G-bit (Stop/Go) when
no subsequent transceiver circuit is present in the terminal. The S/G-bit is evaluated by
the terminal HDLC-controller ICC. It stops data transmission immediately when the S/
G-bit is set to 1 (T-Bit=0).
When an additional transceiver device is integrated in the terminal (e.g. an S-adapter,
PEB 2081 (SBCX)) the control channel is translated into the A/B-bit. The A/B-bit is
monitored by the SBCX. A/B = 1 indicates that the corresponding D-channel is available
(A/B = 0 blocked). Depending on this information, the SBCX controls the E-bit on the
S-bus and the S/G-bit on the IOM-2 interface. When A/B = 0 the E-bit is forced in the
inverted D-bit state, the S/G-bit is set to high. As a result all active transmitters in the
terminal and on the S-bus are forced to abandon their messages.
Data Sheet
3-6
04.99