We discussed the analog VICs modules such as the E&M, FXO, and FXS, but larger organizations that need higher-density interfaces to the PSTN or PBX typically use digital T-1/E-1 modules. The following is a list of digital voice interfaces and supported platforms:
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Digital T-1/E-1 Packet Voice Trunk Network Module, NM-HDV (VWIC-1MFT and VWIC-2MFT) Cisco 2600 and 3600 series. -
Digital voice interface card (DVM) Cisco MC3810. -
Octal or Quad T-1/E-1/PRI feature card Cisco AS5300 universal access server. -
Channelized trunk card and voice feature card Cisco AS5800 universal access server. -
T-1/E-1 high-capacity digital voice port adapter Cisco 7200 and 7500 series.
As with analog, the VICs are inserted into the VNMs to create the digital T-1 voice module for the Cisco 2600 and 3600 series routers. The Cisco 1760 router can use the individual VWIC-2MFT-T-1 card as an interface to a PBX or PSTN for digital connectivity. The card uses a RJ-48 crossover cable for connection to a PBX. The pinouts are listed below:
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Pin 1 RX ring -
Pin 2 RX tip -
Pin 4 TX ring -
Pin 5 TX tip
The items needed for configuration of the controller settings are the following:
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Line interface T-1 or E-1 -
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Line coding AMI or B8ZS for T-1, and AMI or HDB3 for E-1 -
Framing format SF (D4) or ESF for T-1, and CRC4 or no-CRC4 for E-1 -
Number of channels
The controller configuration steps for an ISDN PRI connection to a PBX follow:
router# config terminal router(config)# isdn switch-type basic-ni1 router(config)# controller T-1 1/0 router(config-controller)# framing esf router(config-controller)# clock source internal router(config-controller)# linecode b8zs router(config-controller)# pri-group timeslots 1-24
This produces the following configuration:
(Partial Router configuration) ! hostname router ! memory-size iomem 15 voice-card 1 ! isdn switch-type ni1 ! controller T-1 1/0 framing esf clock source line linecode b8zs pri-group timeslots 1-24 ! interface Serial1/0:23 no ip address no logging event link-status isdn switch-type primary-ni1 isdn incoming-voice voice isdn T310 60000 no cdp enable ! voice-port 1/0:23 !
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