INSTALLATION AND CONFIGURATION
2-16
Document No.: COM-00-05-16 June 2006, Revised June 2014
Version: C.1
The Persistent Serial Tunnel TCP connection is allowed because the HDLC device is allowed to
tunnel, but the TCP connections are not allowed to the serial interface if there is no persistent
tunnel. This prevents an operator from interfering with any HDLC communications that are taking
place on the serial interface.
Figure 2-16. An Example of HDLC Tunneling
2
3
4
1
5
17
24
2
3
3
2
2
Cable 1
Cable 2
RJ45
DB25
DB25
DB25
14
16
14
16
24
18
24
18
17
9
17
9
7
7
WAG
BCM
WAG
Packet
Switch
Figure 2-17. An Example of HDLC Tunneling Cable Interconnections