ADTRAN Total Access OC-3 L3, Installation And Maintenance Practice

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12 61181031L3-5A
source, which provides synchronization status
messages. DCC Options (SONET DCC Provisioning Screen)
Figure 9 represents the top level of the SONET DCC
Provisioning screen. The provisioning options are
included in the following subsections.
Figure 9. SONET DCC Provisioning Menu
OC-3 DCC
The OC-3 DCC provisioning options are as follows:
DCC Mode – In point-to-point data link communica-
tions, one device is the network side (similar to DCE)
and the other is the user side (similar to DTE). The
provisioned value dictates the value of the command/
response (C/R) bit in the address portion of the data link
header. Network devices send commands with C/R=0
and responses with
C/R=1. Data link layer communication will not be
possible if both devices are configured identically. In
addition, this value may be set to “Disabled.” In this
case, DCC communications will not occur.
Information Transfer Service – In point-to-point data
link connections, the communication between peers can
be acknowledged (AITS) or unacknowledged (UITS).
UITS sends data packets in unacknowledged infor-
mation frames (datagrams). There is no easy way of
knowing if the packet has reached the peer; therefore,
lost packet recovery must be handled by higher protocol
layers. AITS establishes a connection with its peer. All
data packets are sent in information frames and are
acknowledged by the peer. Lost packet recovery is
handled by the data link.
Window Size – This option identifies the maximum
number of sequentially numbered frames that may be
outstanding (i.e., unacknowledged) at any given time.
Maximum Retransmissions (N200) – In acknowledged
information transfer mode, this option determines the
maximum number of times a frame will be transmitted
without an acknowledgement being received.
Maximum I-Frame Length (N201) – This option
identifies the maximum number of octets that can occur
in an information frame. Information frames that exceed
this value will be discarded.
Response Time Out (T200) in msec – This timer repre-
sents the maximum time allowed without an
“acknowledge” before the frame is retransmitted or
other recovery action is taken.
Link Inactive Time Out (T203) in msec – This timer
that represents the maximum time allowed without
frames being exchanged. Typically, a receive ready
(RR) supervisory frame will be sent when this timer
expires.
System ID
Uniquely identifies a router within an OSI area. It is the
least significant part of a Network Service Access Point
(NSAP) address. For this change to take effect, the
Shelf: 1 Slot: B Total Access System 01/13/03 09:02
Unacknowledged Alarms: None
Sonet DCC Provisioning
1. OC-3 DCC
2. System ID : 112233445566
3. NSAP Area Address : 39840F80000000000000000000
Terminal ID : STLSMO42
5. Access OSI Stack
Reboot Into New Address
Selection:
'?' - System Help Screen