METRODATA LTD
WCM1100 / WCM3100 / WCM-Serial
User Manual
76-02-082 Rev J
13 of 140
The WCM supports link OAM, IEEE802.3ah and RSTP for loop prevention.
The WCM encapsulates the Ethernet traffic for transport across the WAN link. The WCM
supports HDLC in all cases, and for framed modes X.86 and GFP encapsulations are also
supported. Internal packet buffers enable the WCM to smooth out bursty traffic and
prevent packet loss as the higher layer protocols rate adapt to the WAN capacity.
The WCM1100 E1 port supports unframed, framed (with or without CRC-4 ) or fractional
(Nx64k) operating modes.
The WCM3100 supports unframed or framed operation, supporting E3 G.832 or DS-3 C-
Bit Framing modes.
The WCM-Serial supports unframed operation only, and normally operates as a serial DTE
interface for connection to a carrier NTU. An optional DCE mode, allows for back to back
operation.
1.1 Product Rear Panels
The WCM device is a compact unit, as shown below, occupying half a shelf in a traditional
19inch rack. All power and data connectors and LED status indicators are accessible from
the rear of the unit.
1.1.1 WCM1100
