Chapter 7 Circuits and Tunnels

Virtual Concatenated Circuits

Figure 7-4shows an example of split fiber routing.

Figure 7-4 VCAT Split Fiber Routing

Virtually

 

Concatenated

Intermediate

Group

NE

 

 

Traffic

VCAT

Intermediate

 

Function

NE

Member #1

Member #2

VCAT

Function

with

Differential

Delay Buffer

Traffic

Source VCAT at NE

Intermediate

 

 

NE

 

 

Member #3

Destination VCAT at NE

124065

Table 7-5

Switch Times

 

 

 

 

 

Type of circuit

 

For CE100T-8 card

For CE-MR-6 card

 

 

 

 

CCAT

 

60 ms

60 ms

 

 

 

 

HO VCAT

 

60 ms

90 ms

 

 

 

 

HO LCAS1

 

90 ms

148 ms

LO VCAT

 

202 ms

202 ms

 

 

 

 

LO LCAS

 

202 m

256 ms

 

 

 

 

SWLCAS

 

500 ms

 

 

 

 

1.The calculated number for HO LCAS includes all the inherent delays of the protocol. Also the CE-100-T numbers are for a group size of only three members.

Note The switch time values shown in Table 7-5does not include differential delay. The maximum differential delay for CE100T-8 is 48ms. This differential delay is added to the switch time to get the maximum time.

7.7.3 Link Capacity Adjustment

The CE-100T-8, CE-MR-6, and ML-100T-8 cards support the Link Capacity Adjustment Scheme (LCAS), which is a signaling protocol that allows dynamic bandwidth adjustment of VCAT circuits. When a member fails, LCAS temporarily removes the failed member from the VCAT circuit for the duration of the failure, leaving the remaining members to carry the traffic. When the failure clears, the member circuit is automatically added back into the VCAT circuit. You can select LCAS during VCAT circuit creation.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

 

78-19417-01

7-13

 

 

 

Page 133
Image 133
Cisco Systems 15310-MA manual Link Capacity Adjustment, For CE100T-8 card For CE-MR-6 card

15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

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