Access Egress Queuing and Scheduling

The following sections discuss the queuing and scheduling of access egress traffic, which is traffic that egresses the fabric on the access side:

Access egress scheduling takes place at the native traffic layer. As an example, once the ATM pseudowire payload is delivered from the network ingress to the access egress, the playback of the ATM cells to the appropriate ATM SAP is done according to ATM traffic management specifications.

Access egress scheduling is supported on the adapter cards and ports listed in the following table. The supported scheduling modes are 4-priority and 16-priority. The table shows which scheduling mode each card and port supports at access egress.

Note: For access ingress and egress, the 16-priority schedulers use additional hardware resources and capabilities, which results in increased throughput.
Table: Scheduling Modes Supported by Adapter Cards and Ports at Access Egress

Adapter Card or Port

4-Priority

16-Priority

8-port Gigabit Ethernet Adapter card

Packet Microwave Adapter card

6-port Ethernet 10Gbps Adapter card1

10-port 1GigE/1-port 10GigE X-Adapter card (10-port 1GigE mode)

4-port SAR-H Fast Ethernet module

6-port SAR-M Ethernet module

Ethernet ports on the 7705 SAR-A

Ethernet ports on the 7705 SAR-Ax

Ethernet ports on the 7705 SAR-H

Ethernet ports on the 7705 SAR-Hc

Ethernet ports on the 7705 SAR-M

Ethernet ports on the 7705 SAR-Wx

Ethernet ports on the 7705 SAR-X1

16-port T1/E1 ASAP Adapter card

32-port T1/E1 ASAP Adapter card

2-port OC3/STM1 Channelized Adapter card

4-port OC3/STM1 Clear Channel Adapter card

4-port OC3/STM1 / 1-port OC12/STM4 Adapter card

4-port DS3/E3 Adapter card

T1/E1 ASAP ports on the 7705 SAR-A

T1/E1 ASAP ports on the 7705 SAR-M

TDM ports on the 7705 SAR-X

12-port Serial Data Interface card

6-port E&M Adapter card

6-port FXS Adapter card

8-port FXO Adapter card

8-port Voice & Teleprotection card

8-port C37.94 Teleprotection card

Integrated Services card

1 4-priority scheduler for Gen-3 adapter card or platform.