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Технические характеристики:
| NM-HDV2 Products | Description |
|---|---|
| NM-HDV2 | IP Communications High-Density Digital Voice or Fax Network Module, with no onboard T1/E1 controllers and one VIC/VWIC slot |
| NM-HDV2-1T1/E1 | One-port T1/E1 IP Communications High-Density Digital Voice or Fax Network Module, with one onboard T1/E1 controller and one VIC/VWIC slot |
| NM-HDV2-2T1/E1 | Two-port T1/E1 IP Communications High-Density Digital Voice or Fax Network Module, with two onboard T1/E1 controllers and one VIC/VWIC slot |
This table lists the digital signal processor (DSP) module variants that are used in the NM-HDV2 IP Communications High-Density Digital Voice or Fax Network Modules, and the product numbers to which they correspond.
Table 2
| PVDM2 Products | Description | Maximum Number of Voice/FAX Channels per Codec Complexity | |||
|---|---|---|---|---|---|
| Flexi Complexity (FC) (Default Setting) G.711 (Optimal Use) | Flexi Complexity (Default Setting) All Medium Complexity (MC) and High Complexity (HC) Codecs | Medium Complexity G.729A, G.729AB, G.726, G.711, Clear-Channel, GSMFR, Fax Relay/PassThrough, Modem PassThrough | High Complexity All MC Codecs and also G.723, G.728, G.729, G.729B, GSMEFR | ||
| PVDM2-8 | 8-channel packet fax/voice DSP module, contains one Texas Instruments (TI) C5510 DSP | 8 | 4-8 | 4 | 4 |
| PVDM2-16 | 16-channel packet fax/voice DSP module, contains one TI C5510 DSP | 16 | 6-16 | 8 | 6 |
| PVDM2-32 | 32-channel packet fax/voice DSP module, contains two TI C5510 DSPs | 32 | 12-32 | 16 | 12 |
| PVDM2-48 | 48-channel packet fax/voice DSP module, contains three TI C5510 DSPs | 48 | 18-48 | 24 | 18 |
| PVDM2-64 | 64-channel packet fax/voice DSP module, contains four TI C5510 DSPs | 64 | 24-64 | 32 | 24 |
Features of the NM-HDV2
Some of the features of the NM-HDV2 IP Communications High-Density Digital Voice or Fax Network Module are described in this section.
Telephony Interfaces
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Up to two onboard T1/E1 controllers on the base NM-HDV2 module, with software-selectable T1 or E1 personality through the Cisco IOS® Software CLI. Both onboard controllers must be T1 or both must be E1.
Note: When the onboard controllers are configured for E1 mode, it is possible that the E1 controllers may not come up properly even when connected to known good E1 Telco lines. The output of the show controllers E1 command can indicate large accumulations of Line Code Violations (LCVs) and Path Code Violations (PCVs). The problem can be the result of how the E1 line has been provisioned by the Telco; specifically whether Wet Current is provided or not. On the NM-HDV2 product there are two jumper blocks which control whether the onboard T1/E1 controllers support Wet Current or not. These jumpers are identified on the Printed Circuit Board (PCB) of the Network Module as J6 and J7 (see photograph). J6 is the jumper block for onboard controller 1 while J7 is the jumper block for onboard controller 0. The pin count for each jumper block is from 1 to 3. Pin 1 is the rightmost pin and Pin 3 is the leftmost pin. When Pins 1 and 2 are short-circuited (Right Jumper Setting) the onboard controller is set for "Wet Current Mode", and when Pins 2 and 3 are short-circuited (Left Jumper Setting) the onboard controller is set for "Normal Mode". Early production NM-HDV2s shipped with the jumper blocks set to expect Wet Current to be supplied by the Telco, and this causes problems for some E1 users. When you move the setting to Normal Mode, it typically clears up the problem. Current production NM-HDV2s now ship with the jumper blocks set for Normal Mode.