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MVC8/E&M board provides M signaling time out protection. When this function is enabled,and the duration of the M line in the OffHook state reaches or exceeds the preset value, the time out protection will be triggered. At this time, the M line drive signal is blocked and forced to switch the M line to the OnHook state until the M line is not driven to unmask.
MVC8/E&M card can insert testing signals for each audio or E&M interface,to verify the channel transmission status, and assist the device to open and facilitate maintenance. It can set each audio gain through the network management software to support the data sharing function (all the way to allocate multiple channels),and is suitable for audio service broadcast applications.
Interface type: 2wire or 4wire audio/E&M (software settings)
Signaling method: E&M
Number of ports: 8
Uplink bandwidth: 1~8channel 64k time slots
Transmission code: 64kbps PCM meets ITU-T Rec. G.711 and AT&T Pub. 43801
Impedance: 600 ohms / balance
Transmission level: 0dBm
Return loss: >20db (300Hz~3400Hz)
Frequency response: 1) 0dB ± 0.5dB (300Hz~3000Hz)
2)0dB ± 1.1dB (250Hz~3400Hz)
*Reference frequency: 1020Hz
Transmit level: -10 ~ +5 dBm adjustable, 0.5dB ± 0.15dB per file
Receive level: -17 ~ +2 dBm adjustable, 0.5dB ± 0.15dB per file
Send and receive level threshold: -30 ~ -10dBm
Quantization distortion: 1) >33dB (-30 ~ 0dBm0)
2) >22dB (-45 ~ +3dBm0)
Free channel noise: <-65dBm0 (+20dBmc)
Isolation: 1500VRMS
E&M Signaling Mode: Meets EIA RS-464 types I, II, III and V (similar to British Telecom SSDC5)
M signaling time out protection function (software start up and shutdown)
M signaling time out protection duration: 1~255 seconds
Audio test: insert continuous 0dB/1000Hz test tone
Signaling test: 1) M line: 2s/OnHook ~ 5s/OffHooK for one cycle, repeating cycle
2) E line: 2s/OnHook ~ 5s/OffHooK is one cycle, repeating cycle
Connector: 2 x DB44 (female), 1 out of 4 audio cable (optional)
