| PBX |
用户交换机 |
Private Branch eXchange |
| PCM |
脉冲编码调制 |
Pulse Code Modulation |
| PCN |
个人通信网络 |
Personal Communications Network |
| PCR |
峰值信元速率 |
Peak Cell Rate |
| PCS |
个人通信服务 |
Personal Communications Service |
| PDH |
准同步数字系列 |
|
| PDA |
个人数字助理 |
Personal Digital Assistant |
| PDN |
公用数据网 |
Public Data Network |
| PDU |
协议数据单元 |
Protocol Data Unit |
| PER |
分组差错率 |
packet error rate |
| PEM |
|
Port Expansion Module |
| PIR |
分组插入率 |
packet insertion rate |
| PI/SO |
|
Primary In/Secondary Out |
| PLCP |
物理层会聚协议 |
Physical Layer Convergence Protocol |
| PLR |
分组丢失率 |
packet loss rate |
| PMD |
物理媒体相关（子层） |
Physical Medium Dependent |
| POH |
通道开销 |
|
| PON |
无源光纤网 |
|
| POP |
|
Post Office Protocol |
| PO/SI |
|
Primary Out/Secondary In |
| POTS |
普通老式电话业务 |
Plain Old Telephone Service |
| PPD |
部分舍弃分组数据包 |
Partial Packet Discard |
| PPP |
点到点协议 |
Point to Point Protocol |
| PPTP |
点对点隧道协议 |
|
| PRM |
每分钟可打印输出的页数 |
Page Per Minute |
| PRM |
协议参考模型 |
Protocol Reference Model |
| PRN |
分组无线网 |
Packet Radio Network |
| PSN |
分组交换节点 |
Packet Switch Node |
| PSDN |
分组交换数据网 |
|
| PSTN |
公用电话交换网 |
Public Switched Telephone Network |
| PVC |
永久虚电路（包括PVPC和PVCC） |
Permanent Virtual Circuit |
| PVPC |
|
permanent virtual path connection |
| PVCC |
|
permanent virtual channel connection |
| PVP |
永久虚路径 |
Permanent Virtual Path |