PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 178

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Operational Description
G1 Deactivated
The ISAC-S is not transmitting. No signal detected on the S interface, and no activation
command is received in the C/I channel.
G2 Synchronized
As a result of an INFO1 detected on the S line or an ARD command, the ISAC-S begins
transmitting INFO2 and waits for reception of INFO3. INFO2 is sent after the awake detector
has detected pulses during 4 ms. The timer to supervise reception of INFO3 is to be
implemented in the software.
G3 Activated
Normal state where INFO4 is transmitted to the S interface. This state is reached less than
2 ms after an INFO3 first arrives at the ISAC-S receiver. The ISAC-S remains in this state as
long as neither a deactivation or a test mode is requested, nor a reset pulse is issued.
When receiver synchronism is lost, INFO2 is sent automatically. After reception of INFO3, the
transmitter keeps on sending INFO4.
G4 Pending Deactivation
This state is triggered by a deactivation request DR. It is an unstable state: indication DIU
(state "G4 unacknowledged") is issued by the ISAC-S when:
– either INFO0 is received during 16 ms,
– or an internal timer of 32 ms expires.
G4 Unacknowledged
Final state after a deactivation request. The ISAC-S remains in this state until a response to
DIU (in other words DID) is issued, without which a new activation is impossible.
Test Mode Continuous Pulses
Continuous alternating pulses are sent.
Test Mode Single Pulses
Single alternating pulses are sent (2-kHz repetition rate).
Semiconductor Group
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