Download Configuring the 3512

MODIFY DSU Category
✳ MODIFY
MODIFY DSU
MODIFY DSU parameters specify the primary line interface configuration.
Opmode
Default:
DDS1
Options:
DDS1, DDS2, 64K CC
Description:
Opmode identifies the service type to which the 3512 is connected. Refer to
Chapter 6, 3512 Operation, for details on DDS type services.
DDS1: Configures the unit to use DDS-I type service.
DDS2: Configures the unit to use DDS-II SC type service.
64k CC
64K CC: Configures the unit to use 64k Clear Channel (64k CC) service.
In 64k CC mode, it is possible for data bit sequences to resemble
maintenance codes, such as the Loopback Enable (LLB) code; if the service
provider reports this problem, you can take one of the following actions:
• Set Scrmbler=Enable at both ends of the circuit
• If DTE Config=Normal, set it to Bitstealing, or to Muxed with most or
all of the bandwidth allocated to one channel
• If DTE Config=Muxed or Bitstealing, change the port order in the
P-to-CH parameter, and change the CHn Rate values accordingly
IMPORTANT: Do not enable Scrmbler unless the service provider requests
it (to avoid LLBs).
NOTES:
1) Multipoint DDS-II SC applications at 56 kbps are not supported.
64k CC
2) In 64k CC mode:
• System Status and Circuit Assurance are not supported
• Link Down is the only alarm that can initiate automatic restoral
• Line BER is supported in Muxed and Bitstealing modes only
• The service provider-initiated LLB replaces the network-initiated RT
(DSU) Loopback
4-8 Configuring the 3512