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The Cisco 1-Port and 2-Port E1 Multiflex Voice/WAN Interface Card (VWIC-xMFT-E1, VWIC-xMFT-G703, and VWIC-2MFT-E1-DI) supports voice and data applications on the Cisco 1700, 2600, 3600, and 3700 series routers.
You can use this multiflex trunk as a voice interface card (VIC) or as a WAN Interface Card (WIC) (in a WIC slot in the 1700, 2600, 3600, or 3700). Therefore, the multiflex trunk is a VWIC.
The multiflex trunk provides physical layer E1 access. The host into which you plug the E1 interface determines the E1 interface capabilities.
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When you use the multiflex trunk in a high-density voice network module, each digital service zero (DS0) time slot can contain voice calls. The voice network module, and not the multiflex trunk, determines the E1 signaling capability (E1 R2, ISDN PRI).
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Each multiflex controller can support either one ISDN PRI or E1 channel associated signaling (CAS) or E1 R2 signaling. The reason for this limitation is that each of these signaling types uses the same time slot (16) for trunk signaling.
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If you set up the card to use ISDN PRI signaling, there is no support for ISDN data connection. The card cannot terminate ISDN 64K or 56K data connection; the card only supports voice-call termination with ISDN PRI signaling.
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The multiflex trunk, with or without a high-density voice network module, cannot terminate a modem connection on the router.
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When you use the multiflex trunk in the WIC slot of the 2600, you can configure each E1 into a single channel group as a serial interface.
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The 3600 NM-1E2W, NM-1E1R2W, and NM-2E2W support one serial channel group per WIC slot. Therefore, there is no support for the VWIC-2MFT-E1. Support is available for the VWIC-2MFT-E1-DI, but with one serial channel group.
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The NM-1FE2W, NM-1FE1R2W, NM-2FE2W, and NM-2W support two serial channel groups per WIC slot. Therefore, support is available for VWIC-2MFT-E1. Support is available for VWIC-2MFT-E1-DI with two serial channel groups.
The drop-and-insert feature enables the removal of DS0 time slots from one E1 interface and insertion into time slots of the other E1 interface. This feature is available in VIC and WIC applications. If you configure drop-and-insert, ensure that the E1 framing under the controllers involved (the tdm-groups configuration location) is the same. If you use different frame types, proper understanding of the signaling bits fails. This failure occurs during the drop of a channel from one controller and insertion into a channel from another controller. Drop-and-insert time slots do not need to be contiguous.
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The VWIC-MFT-E1 receiver operates in a short haul mode and can recover a 20-decibel (dB) attenuated signal. In order to translate this to an accurate cable length, you need to know the cable attenuation characteristics. Typical cable attenuation for .4 millimeter (mm) wire is 3 dB per 100 meter (m) (measured at 1024 kilohertz [KHz]). So the maximum cable length for this card is approximately 600 m. This value includes a 3 dB margin.
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Bit error rate tester (BERT) support requires Cisco IOS® Software Release 12.1(1)T or later.
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V.54 loopback requires Cisco IOS Software Release 12.1(1)T or later.
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