T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
7.3.2 Automatic EOC (AUTOEOC) Mode
7 Transmission Superblock (continued)
In the automatic EOC (AUTOEOC) mode, the down-
stream EOC messages are interpreted and acted upon
by the NTN with no need for microcontroller interven-
tion. The appropriate upstream response is automati-
cally generated.
7.3 Data Flow/Activation Control Module
(DFAC)
This module provides the following functions:
■ S/T-interface and U-interface activation/deactivation
control.
The set of EOC messages supported by the NTN are
those defined in ETSI TS 080 and ANSI T1.601, and
are shown in Table 21.
■ U-interface management.
— M4 bit filtering.
— Automatic/manual EOC channel control.
— Register interface.
7.3.3 Manual EOC Mode
In the manual EOC mode, the microcontroller is
responsible for interpreting the downstream EOC mes-
sage, taking the appropriate action, and responding
correctly in the upstream direction.
— Activation/deactivation management.
■ S/T-interface management.
— Register interface.
— Activation/deactivation management.
In both manual and AUTOEOC modes, the NTN stores
the most recent downstream EOC contents in registers
ESR0 and ESR1. The microcontroller can be inter-
rupted on either a single change in the EOC contents
(see bit UIR[EOCSC]) or a trinal-checked change in the
EOC contents (see bit UIR[EOC3SC]). Actions in
response to the standard set of messages shown in
Table 21 can be taken by writing to register ECR0[7:4].
The microcontroller writes the upstream EOC response
to registers ECR0[3:0] and ECR1[7:0]. The half-super-
frame interrupt UIR[RHSF] can be used to determine
the correct EOC message timing.
■ Data flow functions:
— Mapping of B1-, B2-, and D-channel data between
S/T bus and U bus.
— Mapping of D-channel data between the HDLC
transmitter module and the U bus.
— Mapping of B1- and B2-channel data between the
GCI+ interface and the U bus.
7.3.1 EOC State Machine (EOCSM)
EOCSM module processes the downstream EOC. The
received EOC data/message is transferred to the
microcontroller. The upstream EOC channel may
be directly controlled by the microcontroller
(DFCF[AUTOEOC = 0]) or automatically generated
by the EOCSM as shown in Figure 7.
All actions are latched, permitting multiple EOC-initi-
ated actions to be in effect simultaneously. The transi-
tion of transmission system through either receiver
reset or full reset states releases all the outstanding
EOC-controlled operations, and resets the EOC pro-
cessor to return-to-normal.
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Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
