H3C Technologies H3C MSR 50 - Manual (Page 752)

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Figure 749 E&M line configuration page
Table 276 Configuration items
Item Description
Basic Configurations
Description Description of the E&M line.
Cable Type
Select the E&M interface cable type: 4-wire or 2-wire.
By default, the cable type is 4-wire.
When you configure the cable type, make sure the cable type is the
same as that of the peer device. Otherwise, only unidirectional
voice service is available.
The configuration will be applied to all E&M interfaces of the card.