The Cisco® Fourth-Generation 1-, 2-, 4-, and 8-Port T1/E1 Multiflex Trunk Voice and WAN Network Interface Modules (NIMs) support data and voice applications on the Cisco 4000 Integrated Services Routers. These cards combine WAN-interface-card (WIC), voice-interface-card (VIC), ISDN Primary Rate Interface (PRI), dial-access integration, and channelized-data (CE1T1) functions to provide superior flexibility, versatility, and investment protection through their many uses. Customers who choose to integrate data and voice in multiple steps preserve their investment in a T1/E1 WAN interface.

• NIM-1MFT-T1/E1 Specification
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• NIM-1MFT-T1/E1 Specification
  Capacity
  Serial data (channel-group)	2 per port
  E1 unframed G.703	Not supported
  Voice channel associated signaling (CAS) (ds0-group)	24 per port (T1) 31 per port (E1) 1 per timeslot
  PRI (pri-group)	1 per port
  Drop and insert (tdm-group)	24 per port (T1) 31 per port (E1) 1 per timeslot
  T1 Network Interface
  Transmit bit rate	1.544 Mbps ±50 bps/32 ppm
  Receive bit rate	1.544 Mbps ±50 bps/32 ppm
  Line code	Alternate mark inversion (AMI) and binary 8-zero substitution (B8ZS)
  AMI ones density	Enforced for n x 56-kbps channels
  Framing format	D4 (Super Frame [SF]) and Extended Super Frame (ESF)
  Output level (line build-out [LBO])	0, -7.5 or -15 dB
  Input level	+1 dB0 down to -24 dB0
  Data-terminal-equipment (DTE) interface (WIC mode)	Fractional service
  DTE interface (VIC mode)	G.704 or structured
  Data-communications-equipment (DCE) interface	G.704 or structured
  E1 Network Interface
  Transmit bit rate	2.048 Mbps ±100 bps/50 ppm
  Receive bit rate	2.048 Mbps ±100 bps/50 ppm
  Data rate	1.984 Mbps (framed mode) per E1 port
  Clocking	Internal and loop (recovered from network)
  E1 national bits	Fixed (nonconfigurable)
  Encoding	High-density bipolar three (HDB3)
  DTE interface (WIC mode)	Fractional service
  DTE interface (VIC mode)	G.704 or structured
  DCE interface	G.704 or structured
  Module Specifications
  Dimensions (H x W x D)	1.25 x 3.50 x 7.24 in. (3.18 x 8.89 x 18.39 cm)
  Environmental	●  Operating temperature: 0 to 50°C (32 to 122°F) ●  Storage temperature: -20 to +65°C (-4 to 148°F) ●  Relative humidity: 10 to 85% noncondensing operating; 5 to 95% noncondensing, nonoperating
  T1 Compliance (partial list)	●  TIA-968-A ●  CS-03 ●  Jate ●  ANSI T1.403
  E1 Compliance (partial list)	●  TBR4, TBR12, and TBR13 ●  ITU-T G.703, G.704, G.823, and I.431 ●  S016 (Australia)
  Weight	0.40 lb (181g)