Data communications channel
Provisioning the DCC
To support remote operations over the data communications channel (DCC) embedded in the SONET section or SDH regenerator section overhead of the optical signal, the DCC itself must be provisioned as indicated in the following paragraphs.
DCC enable/disable
By default, the DCC is enabled on VLNC50/52/55 SONET/SDH ports. DCC communications can be enabled or disabled on each port independently. DCC is not supported on VLNC64 SONET/SDH ports.
DCC protection mode
The DCC protection mode and user side/network side UPSR/SNCP or 1+1 is determined by the transmission protection mode assigned to the (main OLIUs) optical port (per the application parameter). The ports can be 0x1, 1+1, or UPSR/SNCP.
Link Access Protocol on the D-channel (LAPD) mode
For OSI over DCC, the Data Link layer protocol is Link Access Protocol on the D-channel (LAPD). The LAPD protocol supports the following two modes of local operation:
-
AITS (Acknowledged Information Transfer Service): AITS provides connection-oriented service. It establishes and maintains a logical connection between two NEs over a DCC point-to-point link, providing the means to reliably send and receive data. AITS, which is commonly used in SONET NEs (defined as a default mode in GR-253-CORE), is currently supported.
-
UITS (Unacknowledged Information Transfer Service): UITS provides connection-less service. It transfers data without establishing a logical connection. With the connection-less mode service, there is no guarantee of data delivery or any indication of communication failure. The UITS mode supports DCC interworking with SDH products.
UITS is simpler and has better performance than AITS, but lacks error detection and retransmission (error recovery) functions.
User side and network side
When the LAPD/AITS mode is provisioned, the operation of each DCC span also depends on one end of the span being designated the User side and the other end being designated the Network side. The DCC User/Network side assignments are provisionable.
For UPSR/SNCP, the port dcc-m1-1 is designated the Network side and dcc-m1-2 is designated the User Side. For 0x1 both ports are designated as the Network side.
When the LAPD/UITS mode is provisioned, the User Side/Network Side designations may be the same at both ends of a span. No alarms are reported if both end of the span are designated the same.
The following figure shows the User and Network side designations for Alcatel-Lucent 1850 TSS-5s on a UPSR/SNCP in the LAPD/AITS mode.
Figure 5-5: Default user/network side designation on a UPSR/SNCP (LAPD/AITS mode)
DCC compatibility
Table 5-5, DCC compatibility lists supported DCC communications compatibility for Alcatel-Lucent 1850 TSS-5. Alcatel-Lucent 1850 TSS-5 supports SONET Section or SDH Regenerator Section DCC running the OSI protocol stack.
Table 5-5: DCC compatibility
|
Product |
Optical Interfaces Supported |
VLNC50/52 |
VLNC55 |
|---|---|---|---|
|
Alcatel-Lucent 1850 TSS-5 |
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
OC-48 |
NA |
UPSR, 1+1, 0x1 | |
|
STM-1 |
SNCP, 1+1, 0x1 |
SNCP, 1+1, 0x1 | |
|
STM-4 |
SNCP, 1+1, 0x1 |
SNCP, 1+1, 0x1 | |
|
STM-16 |
NA |
SNCP, 1+1, 0x1 | |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
Alcatel-Lucent 1665 Data Multiplexer |
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
OC-48 |
NA |
UPSR, 1+1, 0x1 | |
|
Alcatel-Lucent 1665 DMXtend |
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
OC-48 |
NA |
UPSR, 1+1, 0x1 | |
|
Alcatel-Lucent 1675 LambdaUnite MSS |
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
OC-48 |
NA |
UPSR, 1+1, 0x1 | |
|
STM-1 |
SNCP, 1+1, 0x1 |
SNCP, 1+1, 0x1 | |
|
STM-4 |
SNCP, 1+1, 0x1 |
SNCP, 1+1, 0x1 | |
|
STM-16 |
NA |
SNCP, 1+1, 0x1 | |
|
Alcatel-Lucent 1850 Transport Service Switch 100 |
OC-3 |
UPSR, 0x1 |
UPSR, 0x1 |
|
OC-12 |
UPSR, 0x1 |
UPSR, 0x1 | |
|
OC-48 |
NA |
UPSR, 0x1 | |
|
Alcatel-Lucent 1850 Transport Service Switch 320 |
OC-3 |
UPSR, 0x1 |
UPSR, 0x1 |
|
OC-12 |
UPSR, 0x1 |
UPSR, 0x1 | |
|
OC-48 |
NA |
UPSR, 0x1 | |
|
DDM-2000 OC-3 |
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
DDM-2000 OC-12 |
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
FiberReach |
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
FT-2000 ADR |
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
WaveStar® TDM 2.5G/10G (2-Fiber) |
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 | |
|
WaveStar® BandWidth Manager, Release 4.0 |
OC-12 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |
|
OC-3 |
UPSR, 1+1, 0x1 |
UPSR, 1+1, 0x1 |