Allowable cross-connections
Overview
This section describes the Alcatel-Lucent 1850 TSS-5 two-way add/drop and pass-through cross-connections.
UPSR/SNCP ring add/drop
A UPSR/SNCP ring add/drop cross-connection is a two-way cross-connection that add/drops traffic to/from a tributary on a UPSR/SNCP protected interface. In the add direction, traffic is bridged to the same tributary in both rotations of the UPSR/SNCP. In the drop direction, the path (tributary) selector monitors both tributaries independently, and selects traffic from one tributary based on performance criteria and technician/OS control.
The following figure shows a high-level schematic of a two-way UPSR/SNCP ring add/drop cross-connection.
Figure 6-1: UPSR/SNCP ring add/drop cross-connection
Unidirectional Path Switched Ring
A Unidirectional Path Switched Ring (UPSR) is a self-healing ring configuration in which traffic is bridged onto both rotations (both fibers) of the ring in opposite directions. Path-switched means that if the working signal fails, the path switches to the protection signal. Protection switching is done independently for each SONET path. UPSRs operate in an integrated, single-ended fashion, negating the need for complex network-level coordination in the effort to restore traffic.
The protection application (UPSR, 1+1, 0x1) can be provisioned independently for each line on the VLNC50/52/55 circuit pack. Cross-connections are supported between the two lines and between 0x1 lines on the different main packs.
Subnetwork Connection Protection
Subnetwork connection protection (SNCP) can be used in an SDH protection ring configuration, similar to UPSR for SONET. SNCP rings have duplicate fiber paths. Traffic flows in one direction around the ring and protection traffic flows in the opposite direction. If there is a problem that interrupts or creates errors in the working traffic path, the node receiving the errors or sensing the interruption switches to the path in the opposite direction. SNCP on Alcatel-Lucent 1850 TSS-5 only allows pairing of the same timeslot on the two network lines of the VLNC50/52/55 circuit pack.
The protection application (SNCP, 1+1, 0x1) can be provisioned independently for each line on the VLNC50/52/55 circuit pack. Cross-connections are supported between the two lines and between 0x1 lines on the different main packs.
0x1 add/drop
A 0x1 add/drop cross-connection is a terminated cross-connection between a ring channel on an OC-3/STM-1, OC-12/STM-4, or OC-48/STM-16 (VLNC55) main port that has an application value of 0x1 to a PDH (DS1/E1 or DS3/E3) port or to an Ethernet port.
Hairpin
A hairpin is a 0x1 to 0x1 two-way cross-connection between a ring channel on an an OC-3/STM-1, OC-12/STM-4, or OC-48/STM-16 (VLNC55) main port that has an application value of 0x1 to another main port, that has the application value 0x1.
2-Way hairpin
2-Way hairpin is a two-way cross-connection between a DS1 port in virtual function group A (VLNC50/52/55) and a DS1 port within a channelized DS3 in virtual function group B-3 (VLNC50/52/55).
Linear 1+1
The linear application mode is a standards compliant 1+1 protected configuration, providing unidirectional, non-revertive line switching. Protected cross-connections between the two 1+1 lines, between a UPSR/SNCP and a 1+1 line, between a 0x1 and 1+1 line, or between a PDH or Ethernet port and a 1+1 line are supported.
Linear/Unprotected UPSR/SNCP
Linear/Unprotected UPSR/SNCP is a two-way cross-connection between a tributary on one side of a UPSR/SNCP interface and a tributary on a VCG port in Function Group C or a DS1/E1 port in Function Group A.
Point-to-point, through
A point-to-point, through cross-connection is a two-way cross-connection between the two sides of a UPSR/SNCP node. Traffic received on a timeslot on one side of the UPSR/SNCP node is passed through to the same timeslot on the opposite side of the UPSR/SNCP node.
The following figure shows a pass-through cross-connection on the network interface (OC-3/STM-1, OC-12/STM-4, or OC-48/STM-16 (VLNC55).
Figure 6-2: Point-to-point, through cross-connection
Allowable 1+1 add/drop cross-connections
Table 6-4, Allowable 1+1 add/drop cross-connections lists add/drop cross-connections supported by Alcatel-Lucent 1850 TSS-5. The cross-connections in the following table are all add/drop cross-connections.
Table 6-4: Allowable 1+1 add/drop cross-connections
|
Source |
Destination | ||
|---|---|---|---|
|
OC-3/OC-12/OC-48 (1+1) | |||
|
2waypr STS-3c |
to |
VCG Tributary | |
|
2waypr STS-1 |
to |
VCG Tributary | |
|
2waypr VT1.5 |
to |
VCG Tributary | |
|
2waypr STS-1 |
to |
DS3 | |
|
2waypr VT1.5 |
to |
DS1 | |
|
STM-1/STM-4/STM-16 (1+1) | |||
|
2waypr VC-3 (low-order) |
to |
VCG Tributary | |
|
2waypr VC-4 |
to |
VCG Tributary | |
|
2waypr VC-12 |
to |
VCG Tributary | |
|
2waypr VC-3 (low-order) |
to |
E3 | |
|
2waypr VC-12 |
to |
E1 | |
Allowable UPSR/SNCP ring add/drop cross-connections
The following table lists the supported UPSR/SNCP ring add/drop cross-connections.
Table 6-5: Allowable UPSR/SNCP ring add/drop cross-connections
|
Source |
Destination | ||
|---|---|---|---|
|
OC-3/OC-12/OC-48 VLNC50/52/55 (UPSR) | |||
|
2waypr STS-12c 1 |
to |
VCG Tributary | |
|
2way STS-12c 1 |
to |
VCG Tributary | |
|
2waypr STS-3c |
to |
VCG Tributary | |
|
2way STS-3c |
to |
VCG Tributary | |
|
2waypr STS-1 |
to |
VCG Tributary | |
|
2way STS-1 |
to |
VCG Tributary | |
|
2waypr VT1.5 |
to |
VCG Tributary | |
|
2way VT1.5 |
to |
VCG Tributary | |
|
2waypr STS-1 |
to |
DS3 | |
|
2way VT1.5 |
to |
DS1 | |
|
2waypr VT1.5 |
to |
DS1/TMUX | |
|
STM-1/STM-4/STM-16 VLNC50/52/55 (SNCP) | |||
|
2waypr VC-3 (low-order) |
to |
VCG Tributary | |
|
2way VC-3 (low-order) |
to |
VCG Tributary | |
|
2waypr VC-4 |
to |
VCG Tributary | |
|
2way VC-4 |
to |
VCG Tributary | |
|
2waypr VC-12 |
to |
VCG Tributary | |
|
2way VC-12 |
to |
VCG Tributary | |
|
2waypr VC-3 (low-order) |
to |
E3 | |
|
2way VC-12 |
to |
E1 | |
|
2waypr VC-12 |
to |
E1 | |
Notes:
Allowable hairpin cross-connections
The following table lists the supported hairpin cross-connections.
Table 6-6: Allowable hairpin cross-connections
|
Source |
Destination | ||
|---|---|---|---|
|
OC-3/OC-12/OC-48 VLNC50/52/55 (UPSR/1+1) | |||
|
2waypr STS-12c 1 |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1, 0x1) | |
|
2waypr STS-3c |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1, 0x1) | |
|
2waypr STS-1 |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1, 0x1) | |
|
2waypr VT1.5 |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1, 0x1) | |
|
OC-3/OC-12/OC-48 VLNC50/52/55 (0x1) | |||
|
2way STS-12c 1 |
to |
OC-3/OC-12/OC-48 (0x1) | |
|
2way STS-3c |
to |
OC-3/OC-12/OC-48 (0x1) | |
|
2way STS-1 |
to |
OC-3/OC-12/OC-48 (0x1) | |
|
2way VT1.5 |
to |
OC-3/OC-12/OC-48 (0x1) | |
|
2waypr STS-12c 1 |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1) | |
|
2waypr STS-3c |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1) | |
|
2waypr STS-1 |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1) | |
|
2waypr VT1.5 |
to |
OC-3/OC-12/OC-48 (UPSR, 1+1) | |
|
STM-1/STM-4/STM-16 VLNC50/52/55 (SNCP/1+1) | |||
|
2waypr VC-4-4c 1 |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1, 0x1) | |
|
2waypr VC-4 |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1, 0x1) | |
|
2waypr VC-3 (low-order) |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1, 0x1) | |
|
2way VC-12 |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1, 0x1) | |
|
STM-1/STM-4/STM-16 VLNC50/52/55 (0x1) | |||
|
2way VC-4-4c 1 |
to |
STM-1/STM-4/STM-16 (0x1) | |
|
2way VC-4 |
to |
STM-1/STM-4/STM-16 (0x1) | |
|
2way VC-3 (low-order) |
to |
STM-1/STM-4/STM-16 (0x1) | |
|
2way VC-12 |
to |
STM-1/STM-4/STM-16 (0x1) | |
|
2waypr VC-4-4c 1 |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1) | |
|
2waypr VC-4 |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1) | |
|
2waypr VC-3 (low-order) |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1) | |
|
2waypr VC-12 |
to |
STM-1/STM-4/STM-16 (SNCP, 1+1) | |
|
DS1 VLNC50/52/55 | |||
|
DS1 (2way VT1.5) |
to |
TMUX DS1 | |
Notes:
Allowable 0x1 cross-connections
The following table lists the supported 0x1 cross-connections.
Table 6-7: Allowable 0x1 cross-connections
|
Source |
Destination | ||
|---|---|---|---|
|
OC-3/OC-12/OC-48 VLNC50/52/55 (add/drop) | |||
|
2way STS-12c 1 |
to |
VCG Tributary | |
|
2way STS-3c |
to |
VCG Tributary | |
|
2way STS-1 |
to |
VCG Tributary | |
|
2way STS-1 |
to |
DS3 | |
|
2way VT1.5 |
to |
VCG Tributary | |
|
2way VT1.5 |
to |
DS1/TMUX | |
|
STM-1/STM-4/STM-16 VLNC50/52/55 (add/drop) | |||
|
2way VC-4-4c 1 |
to |
VCG Tributary | |
|
2way VC-4 |
to |
VCG Tributary | |
|
2way VC-3 (low-order) |
to |
E3 | |
|
2way VC-3 (low-order) |
to |
VCG Tributary | |
|
2way VC-12 |
to |
E1 | |
|
2way VC-12 |
to |
VCG Tributary | |
Notes:
Allowable point-to-point, through cross-connections
The following table lists the supported pass-through cross-connections.
Table 6-8: Allowable point-to-point through cross-connections
|
Source |
Destination | ||
|---|---|---|---|
|
OC-3/OC-12/OC-48 VLNC50/52/55 (UPSR) | |||
|
2waypr STS-12c |
to |
OC-3/OC-12/OC-48 UPSR 1 | |
|
2waypr STS-3c |
to |
OC-3/OC-12/OC-48 UPSR 1 | |
|
2waypr STS-1 |
to |
OC-3/OC-12/OC-48 UPSR 1 | |
|
2waypr VT1.5 |
to |
OC-3/OC-12/OC-48 UPSR 1 | |
|
STM-1/STM-4/STM-16 VLNC50/52/55 (SNCP) | |||
|
2waypr VC-4-4c |
to |
STM-1/STM-4/STM-16 SNCP 1 | |
|
2waypr VC-4 |
to |
STM-1/STM-4/STM-16 SNCP 1 | |
|
2waypr VC-3 (low-order) |
to |
STM-1/STM-4/STM-16 SNCP 1 | |
|
2waypr VC-12 |
to |
STM-1/STM-4/STM-16 SNCP 1 | |