Cisco IGX 8 User Manual download pdf (Page 10)

Circuit Data Services

Circuit data capabilities enable synchronous or

asynchronous legacy data or video to be transported across

the WAN through a ﬁxed-delay, ﬁxed-throughput, zero

discard, point-to-point data connection. Available speeds

range from 1.2 kbps to T1/E1 using standard interfaces

such as V.28/RS-232, V.11/X.21 or V.35, EIA/TIA-449,

and T1/E1. These services can also be used to migrate

aging TDM networks to a new, multiservice backbone.

Data Compression

Unique to the IGX 8400 series is the capability to

dynamically compress data connections (up to 128 kbps)

by using RPS. With RPS, one end of a data connection

determines the repetitive pattern and the number of pattern

occurrences and does not assemble them into cells for

network transport. The far end of the data connection

determines the repetitive pattern and pattern occurrences

by monitoring the incoming cells and their sequence

numbers and regenerates these patterns to the user

interface. This capability is effective when implementing

SDLC/HDLC connections across the network, because idle

conditions (ﬂags 7E) can be suppressed and not transported.

Flexible Clocking, Lead Monitoring, and Control

IGX circuit emulation interfaces offer ﬂexible clocking

to accommodate the connection of colocated or remote

devices to an IGX 8400 series network. These interfaces

also monitor control leads on each interface, using changes

to “condition” the leads at the far end of the connection.

The IGX switch can also be conﬁgured to use a change

in lead status on a circuit data interface to trigger

an action in the network. This feature can be used to

dynamically set up bandwidth-on-demand connections

across the wide-area network.

Networking Connectivity

A network of IGX 8400 series switches can be deployed

with a variety of trunk interfaces and speeds ranging

from 64 kbps to 155 Mbps. Network trunks can be

implemented using dedicated leased-line facilities or

via public ATM services.

B andwid

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Cisco IGX 8 User Manual Page 10