AIS AI2524 Manuel D’Utilisation
Chapter 15: 56/64-kbps Switched and Digital Data Services (DDS) Interface
August 1997
Page 15-3
2524UM
Enable
Scrambled Data
Coding
Scrambled Data
Coding
In interface configuration mode, prevent application data from repli
cating loopback codes when operating at 64-kbps on a 4-wire CSU/
DSU by scrambling bit codes before transmission:
cating loopback codes when operating at 64-kbps on a 4-wire CSU/
DSU by scrambling bit codes before transmission:
service-module 56k data-coding scrambled
Enable the scrambled configuration only in 64-kbps digital data ser-
vice (DDS) mode. If the network type is set to switched, the configu-
ration is refused.
vice (DDS) mode. If the network type is set to switched, the configu-
ration is refused.
If you transmit scrambled bit codes, both CSU/DSUs must have this
command configured for successful communication.
command configured for successful communication.
In interface configuration mode, enable normal data transmission fo
the 4-wire 56/64-kbps module, which is the default:
the 4-wire 56/64-kbps module, which is the default:
service-module 56k data-coding normal
or
no service-module 56k data-coding
Change between
DDS and
Switched Dial-Up
Modes
DDS and
Switched Dial-Up
Modes
In interface configuration mode, transmit packets in switched dial-up
mode or DDS mode using the 4-wire 56/64-kbps CSU/DSU module:
mode or DDS mode using the 4-wire 56/64-kbps CSU/DSU module:
service-module 56k network-type dds
or
service-module 56k network-type switched
Do not use any form of these commands to transmit from a dedicated
leased line in DDS mode. DDS is enabled by default for the 4-wir
CSU/DSU. Switched mode is enabled by default for the 2-wire CSU/
DSU.
leased line in DDS mode. DDS is enabled by default for the 4-wir
CSU/DSU. Switched mode is enabled by default for the 2-wire CSU/
DSU.
In switched mode, you need additional dialer configuration commands
to configure dial-out numbers. Before you enable the
to configure dial-out numbers. Before you enable the
service-
module 56k network-type switched
command, both CSU/
DSUs must use a clock source coming from the line and the clock rate
must be configured to auto or 56k kbps. If the clock rate is not set cor-
rectly, this command will not be accepted.
must be configured to auto or 56k kbps. If the clock rate is not set cor-
rectly, this command will not be accepted.
The 2-wire and 4-wire 56/64-kbps CSU/DSU modules use V.25 bis
dial commands to interface with the router. Therefore, the interfac
must be configured using the
dial commands to interface with the router. Therefore, the interfac
must be configured using the
dialer in-band
command. DTR
dial is not supported.
Warning: Any loopbacks in progress are terminated when switching
between modes.