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Short Range Modems PCM2D/PCM2L
Discontinued, recommended replacement is: PCM2/M
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Features:
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The PCM2 is a high speed short range modem connecting synchronous DTEs such as routers or computers over two twisted pairs or two coaxial cables of up to 2.5 km. With G.703 (2048 kbps) as a line interface it operates at six selectable data rates, from 64 kbps to 2048 kbps.
On the digital side, a choice of V.35, RS-232, RS-530, multi-standard or Ethernet
interface is available.
The multi-standard interface supports V.35, RS-530, RS-232 and X.21 standards. User
has the flexibility to change the interface type by changing only the interface
cable. V.35 interface has the standard M34 female connector.
Pair of modems with Ethernet interface forms the remote bridge to connect LANs.
The PCM2D modem is available as a stand-alone unit or as a card for 19'' 3U high Cronyx rack.
The PCM2L modem is low-cost modification of the PCM2 modem. The difference between PCM2L and PCM2D versions is as follows:
- PCM2L uses DB15 connector type on G.703 interface (PCM2D modem has terminal block).
- PCM2L has no alarm interface.
- PCM2L is available as a stand-alone unit only.
PCM2D setup is performed by microswitches on the bottom cover of the unit. Front panel buttons control all diagnostics options including loopbacks and BER testing.
Stand-alone models may be ordered with 220VAC or 36 to 72VDC power supply.
| G.703 Interface (2048 kbps) | |
|---|---|
| Connector Type (for PCM2D modem) | Terminal Block |
| Connector Type (for PCM2L modem) | DB15 |
| Line Code | HDB3 |
| Line Impedance | 120 Ohm Balanced (Twisted Pair) or 75 Ohm Unbalanced (Coax Cable), Switches selectable |
| Receive Signal Attenuation Range | from 0 to 43 dB (up to 2.6 km of 22 AWG twisted-pair cable) |
| Transmit Timing Sources | INT (Internal Oscillator), RCV (Receiver), EXT (Digital Interface) |
| Jitter Attenuator | In both the receive and the transmit paths, 120UIpp attenuation |
| Error Detection | Bipolar Violation |
| Digital Interface | |
| Data Transfer Rate | 2048,1024, 512, 256, 128, or 64 kbps |
| Async data rates | 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, 115.2 kbps |
| Async symbol formats | 8N1, 8P1, 8N2, 7P2, 7P1 |
| Clock Options Supported | TXC, RXC, ETC |
| Modem Control Signals Supported | DTR, DSR, CTS, RTS, CD |
| Interface Ethernet | |
| Interface | 10/100Base-T |
| Connector Type | RJ-45 (female) |
| Data Transfer Rate | 2048,1024, 512, 256, 128, or 64 kbps |
| Mode | 100 Mbps Full-duplex, 100 Mbps Half-duplex, 10 Mbps Full-duplex, 10 Mbps Half-duplex, or Autonegotiation |
| Address table size | 15000 MAC addresses |
| Maximum packet size | 4224 bytes, including MAC header |
| Protocols | Transparent or Cisco-HDLC bridging IEEE protocol, automatically selected |
| Quality of Service | 8 priority levels |
| Alarm Interface (for PCM2D modem only) | |
| Connector Type | 6 Pins Mini-DIN |
| Relay Contact Current | up to 250 ma |
| Relay Contact Voltage | up to 175 VDC |
| Diagnostics | |
| Loopbacks | Digital, Remote and Line Loops |
| BER Tester | Activated by pushbutton |
User's Manual for models PCM2D and PCM2L with Ethernet 10/100Base-T interface, in Russian
For devices since 01/06/2007: User's Manual for models with PCM2D and PCM2L with V.35/RS-530/RS-232/X.21 interface, in Russian
For devices before 01/06/2007: User's Manual for models with PCM2D and PCM2L with V.35/RS-530/RS-232/X.21 interface, in Russian
Cronyx interface cables guide
Return to Modems-Converters G.703 or Digital Communication Equipment