Zhone Technologies IMACS Network Device - Manual (Page 88)

Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 84
Service Provider
Central Office
Nx56/64
Multi-tenant Premises
X.25 PAD
Mainframe
PBX/Key
System
Router
Backup Link
DS1/E1
IMACS
DACS
Frame Relay
Network
PSTN
Nx56/64 or T1/E1
Figure 33—Frame Relay and Internet Services Using IMACS’ FRAD Server
IDSL Service Provisioning
An IMACS with a Frame Relay server can be used for efficient ISDN DSL (IDSL) provisioning for Internet access
at speeds up to 128K. Each IMACS BRI card provides up to eight IDSL ports over single twisted pair wire. There
can be up to seven such BRI cards in an IMACS800/900. This arrangement cost-effectively replaces external DDS
CSU/DSU equipment and offers higher bandwidth.
Each Frame Relay server supports up to 35 NTUs at 128K over 1 T1 (with 3:1 concentration) or 1 E1 (with 2.5:1
concentration), thereby taking advantage of frame relay’s statistical multiplexing capabilities. Up to 64 DS0s are
channelized through the Frame Relay Server ports and are concentrated onto a single port connected to the network.
Three concentrator ports bring in additional NXDS0s channels to be concentrated onto the single outgoing port as
shown in Figure 34.