Carrier Access 1750 Manual De Usuario

Choose the slot (A or B) containing the OC-12c/STM-4c to be configured and a 
parameter input screen appears. The table below is a guide to parameter configuration. 

If a second OC-12c/STM-4c is installed, repeat this process for the configuration. 
Follow the module-specific information above, as appropriate.

Port Mode

This field is a status indicator and the items displayed are 
the result of configuration (or other) actions.

Framing Type

SDH is for International ITU applications. SONET is for 
US applications.

Transmit Timing

Recovered means from SONET. 
BITS impedance matching is a hardware function; see 
NIM Installation, Chapter 3. BITS is tied to the local in-
house timing source. 
Local is on-board Stratum 3 timing source.

SONET Tx

If SONET Tx is enabled, framing is enabled; if SONET 
Tx is disabled, framing is removed (i.e., SONET Tx is all 
zeroes).

Loopback Mode

Normal is no loopback. 
Terminal is a loopback from the ATM interface to the 
user equipment. 
Local is a loopback before NIM processing to the fiber 
link. Remote is a loopback from the receive fiber to the 
ATM before local processing.

ATM Payload 
Scramble Mode

A technique used to prevent a long string of zeros. Both 
ends of a connection must be configured the same for 
operation. 

BITS Clock Alarm 
Loss

Provides an alarm indication of loss of BITS clock at the 
NIM IOM when enabled. A corresponding BITS LOS 
SNMP trap is generated if SNMP is configured properly.