Number of Subscribers	1000 (Maximum); per DIU
Number of CBS	20 (Maximum); per DIU
Number of BSDs	5 (Maximum); per DIU
Operating Frequency (Mhz)	DB1 1880 – 1900 DB2 1900 – 1920 DB3 1910 – 1930
Redundancy	Hot Standby provided for all single point failures, except failure of interface cards.
Network Configuration	Local Exchange with R2MF signaling on E1 interface. Access unit with V5.2 interface on E1 lines. DID-PBX with R2-MF signaling on E1 lines & Two-wire junction lines. PBX with two wire junction lines.
Busy Hour Call Attempts (BHCA)	20,000
Maximum Traffic per CBS	5 erlang at 0.5% blocking; supports typically 33 subscribers at 0.15 Erlang/sub. 50 subscribers at 0.1 Erlang/sub. & 70 subscribers at 0.07 Erlang/sub
Voice Coding	Toll Quality, 32 kbps ADPCM as per ITU T G. 726
Instruments Supported	Standard two wire telephone or payphone with battery reversal & 16/12 KHz (optional) metering pulse. Modems up to 9.6 kbps, G3 Fax. RS 232 Interface to PC for 35 or 70 kbps internet access
Number of Tones	Up to 11
Number of 3 party conferences	8
Number of Announcements	10 (2 six-second segments played alternately for each announcement.)
Modulation	GFSK, MC-TDMA
Data Transmission Rate	35 kbps (simultaneous vice and data) or 70 kbps data only.