3Com S330 manual DS3/E3 UNI Module, Menu. shows the DS3 UNI Configuration menu. The E3 UNI

Configuring the DS3/E3 UNI Module 105

Configuring the	To configure the DS3 UNI or E3 UNI module, follow these steps:
DS3/E3 UNI Module
	1 From the List Card menu, select [9] DS3 UNI to open the DS3 UNI Configuration
	menu. Figure 75 shows the DS3 UNI Configuration menu. The E3 UNI
	Configuration menu is similar.
	Figure 75 DS3 UNI Configuration Menu

2Set the following parameters as desired:

Admin Status—Administrative Status: In Service or Out of Service.

LBO Length (DS3 only)—Line Build Out length. The signal generation/regeneration of the distance between the PathBuilder S600 and the next crossconnect or FOTs (Fiber Optic Terminal system), in feet: 0-225or 225-450.

DS3 Framing Mode (DS3 only)—The type of frame organization configured for the specified port interface: Cbit or M23. Set this parameter to match the framing type offered by your service provider. Cbit is the most common setting, as its use of overhead bits for administration and maintenance allows the service provider more visibility in isolating any issues with the physical line connections through the WAN. You must match this setting at the two ends of the DS3 trunk.

ATM Cell Mapping—How the carrier will provision the DS3 UNI service from the carrier ATM switch: Clear (HEC) or PLCP (Physical Layer Convergence Protocol). Clear is the option preferred by both domestic and international service providers and within private ATM networks, as it gives more payload bandwidth than PLCP. You must match this setting at the two ends of the DS3 trunk.

ATM Payload Scramble—Enables (yes) or disables (No) payload scrambling for the DS3 port. Payload scrambling scrambles the 48-byte payload in outgoing cells in a defined manner and unscrambles the payload in incoming cells. It is a technique used to avoid certain transmission equipment behaviors (for example, erroneous alarm conditions) that are caused by sensitivity to certain bit patterns in the ATM payload. You must match this setting at the two ends of the DS3 trunk.