OSI/FTAM Configuration and Management Manual

Introduction to Tandem FTAM
OSI/FTAM Configuration and Management Manual—421944-001
1-12
Tandem FTAM in the OSI Reference Model
Tandem FTAM in the OSI Reference Model
Figure 1-4 shows how the Tandem FTAM architecture fits into the various layers of the
OSI Reference Model for both LANs and WANs. OSI/AS, OSI/TS, TLAM, X25AM,
PAM, and TCP/IP are represented by their respective TAPS, TSP, and NSP processes.
The figure also shows the hardware used to implement lower-layer communications
through TLAM, PAM, or X25AM, as defined under Hardware Requirements
on
page 1-13.
Figure 1-4. Tandem FTAM in the OSI Reference Model
006CDT .CDD
Network Layer
Data Link Layer
Transport Layer
Session Layer
WAN LAN
Physical Layer
Application Layer
Presentation Layer
Tandem FTAM
TAPS
(OSI/AS)
NSP
(X25AM )
NSP
(TLAM or PAM)
Controllers
RS-232C,
RS-449,
X.21, V.35
Controllers
50-ohm
Baseband
TSP
(OSI/TS)
Application
User
API
TSP
(TCP/IP)
NSP
(X25AM)
NSP
(TLAM or PAM)
Controllers Controllers
WAN
LAN
RS-232C,
RS-449,
X.21, V.35
50-ohm
Baseband