Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 165

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Features
Basic Rate Interface (BRI)
For Release 6.0 and later systems (Hybrid/PBX mode only), refer to the Network
Reference for information on clock switching for private networks.
Timers and Counters
This option sets the timer and counter thresholds. The factory settings for
thresholds are standard and rarely need to be changed. (See "At a Glance" in this
section for factory settings and valid ranges.) When no response is received from
the network before the duration of the timer setting, the communications system
takes the appropriate corrective action.
The programmable timers and counters are as follows:
T200 Timer. Times the minimum time that the link layer waits for an
acknowledgment of link establishment, information, or polling supervisory
frames sent from the communications system to the network before
resending the frames.
T203 Timer. Maximum time that the link layer can remain inactive.
T303 Timer. Times the delay in network response when the
communications system sends a setup message to initiate an outgoing
call.
T305 Timer. Times the delay in network response when the
communications system sends a disconnect message to clear a call.
T308 Timer. Times the delay in network response when the
communications system sends a release message to clear a call.
Other timers and counters used by the system are not programmable:
N200 Counter. Counts the number of times the communications system
can transmit a message on a D-channel because no link layer
acknowledgment is received from the network. The value for this counter
is 3.
N201 Counter. Counts the maximum number of Layer 3 bytes the system
can send or receive in a single D-channel message. The value for this
counter is 260.
N202 Counter. Counts the maximum number of times that Layer 2 should
retransmit TEI-REQUEST frames before notifying Layer 3. The value of
this counter is 3.
K Counter. Counts the number of Layer 3 unacknowledged messages
sent from the communications system to the network on a D-channel. The
value for this counter is 1.
T202 Timer. Minimum time Layer 2 must wait for an acknowledgment of a
TEI-REQUEST frame before initiating retransmission. The value of this
timer is 2 seconds.
Issue 1
April 1999
105