ACCULINK 3163 DSU/CSU
3-14 March 1999 3163-A2-GB20-10
Selecting the Link Layer Protocol
Two link layer protocols, Point-to-Point Protocol (PPP)
and Serial Line Internet Protocol (SLIP), are supported for
connection to an external Telnet device or network device
(e.g. a router). PPP can be used for synchronous or
asynchronous operation. SLIP can be used for
asynchronous operation only.
The standalone DSU/CSU implementation of PPP
supports the following:
•Full negotiation of PPP’s Link Control Protocol
(LCP).
•Active negotiation of LCP when the connection is
established.
•Maximum Request Unit (MRU) sizes up to
1500 bytes, but the DSU/CSU will attempt to
negotiate down to 500 bytes.
•The DSU/CSU provides a unique LCP magic
number derived from the unit serial number and the
elapsed time.
•Full negotiation of escape characters.
The DSU/CSU implementation of PPP does not
support Link Quality Reports (LQR), compression,
encryption, Password Authentication Protocol (PAP) or
Challenge Handshake Authentication Protocol (CHAP).
The DSU/CSU implementation of SLIP supports a
fixed MRU size of 1006 bytes.
Before selecting the protocol, you must first select the
port to be used as the communications link. Refer to the
Selecting the Port section on page 3-12. This example
assumes that the COM port is being used as the
communications link.
"Procedure
To select the link layer protocol:
1. From the top-level menu screen, select Cnfig.
2. Select the configuration option set to be copied
into the Edit area by using the appropriate
Function key. Use the scroll keys, if necessary.
3. Select Edit.
4. From the Edit screen, press the key until the
Mgmt selection appears on the screen.
5. Select Mgmt.
F1
Edit:
User Alarm Mgmt
F2 F3
6. From the Mgmt Config screen, select Gen.
F1
Mgmt Config:
Gen
F2 F3
7. Press F1 (Next) until the Com Link configuration
option appears.
8. Press F2 (PPP) or F3 (SLIP).
F1
Com Link:
Next PPP SLIP
F2 F3