psf2115 ETC-unknow, psf2115 Datasheet - Page 209

• Manufacturer Part Number: psf2115
• Description: Isdn Adapter Circuit Ipac
• Manufacturer: ETC-unknow

PSB 2115
PSF 2115
Operational Description
3.6.5.4
States Intelligent NT Mode
G1 Deactivated
The IPAC is not transmitting. No signal is detected on the S/T-interface, and no
activation command is received in C/I channel. DI is output in the normal deactivated
state, and TIM is output as a first step when an activation is requested from the S/T-
interface.
G1 I0 Detected
An INFO 0 is detected on the S/T-interface, translated to an “Activation Request”
indication in the C/I channel. The IPAC is waiting for an AR command, which normally
indicates that the transmission line upstream (usually a two-wire U interface) is
synchronized.
G2 Pending Activation
As a result of the ARD command, and INFO 2 is sent on the S/T-interface. INFO 3 is not
yet received. In case of ARL command, loop 2 is closed.
G2 wait for AID
INFO 3 was received, INFO 2 continues to be transmitted while the IPAC waits for a
“switch-through” command AID from the device upstream.
G3 Activated
INFO 4 is sent on the S/T-interface as a result of the “switch through” command AID: the
B and D-channels are transparent. On the command AIL, loop 2 is closed.
G2 Lost Framing S/T
This state is reached when the IPAC has lost synchronism in the state G3 activated.
G3 Lost Framing U
On receiving an RSY command which usually indicates that synchronization has been
lost on the two-wire U interface, the IPAC transmits INFO 2.
G4 Pending Deactivation
This state is triggered by a deactivation request DR, and is an unstable state. Indication
DI (state “G4 wait for DR”) is issued by the IPAC when:
either INFO0 is received
or an internal timer of 32 ms expires.
Semiconductor Group
209
11.97