Configuration 791See Table 306 "Pad switching algorithm" (page 791) for the pad switchingcontrol for the various through connections and the actual port-to-port lossintroduced for connections between the E and M Trunk card and any otherIPE port designated as Port B.Figure 256 "Pad orientation" (page 791) shows the pad switching orientation.Table 306Pad switching algorithmPort B pads E and M Trunk Pads Port-to-port loss (dB)Port BTransmitD to AReceiveA to DTransmitD to AReceiveA to DPort B toE and ME and M toPort BIPE line N/A N/A Out In 2.5 3.5Universaltrunk (TRC)Out Out In In 0 0IPE TIE (VNL) In Out In Out 0 0Note: Transmit and receive designations are from and to the system. Transmit is from the system tothe external facility (digital-to-analog direction in the E and M Trunk card). Receive is to the systemfrom the external facility (analog-to-digital direction in the E and M Trunk card).Loss parameters are selected on the E and M trunk card by a switchablepad controlled by Codec emulation software. For convenience in thisdiscussion, the pads settings are called "in" and "out." Pad settings aredetermined by the three factors listed below: the first two are under directuser control; the third is controlled indirectly.Figure 256Pad orientation• Class of service is assigned in LD 14.• Facility termination is selected (2-wire or 4-wire) in LD 14 (the 2-wiresetting provides 0.5 dB more loss in each direction of transmission forecho control).Nortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
